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Posted: 4/20/2021 2:46:28 PM EDT
[#1]
Is the 30-06 made specifically for the M1 still OK?
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Posted: 4/20/2021 3:57:28 PM EDT
[#2]
I have a feeling this will go like other ammo related threads. Just be aware I am watching and no warnings will be given if bickering starts. Keep it civil and keep it tight or you will get a timeout.
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Posted: 4/20/2021 6:37:47 PM EDT
[#3]
Quote HistoryQuoted: I have a feeling this will go like other ammo related threads. Just be aware I am watching and no warnings will be given if bickering starts. Keep it civil and keep it tight or you will get a timeout. They just said that commercial ammo is fine. |
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Posted: 4/20/2021 7:11:17 PM EDT
[#4]
Yeah
 Hoooo boy! Sounds like ol'Jeremy just got schooled. LOL!  Link sez ammo pressure limit for 'Garand-Safe' .30-06 is 50K C.U.P. limit ... or else possible KABOOM-ski! I think CMP got wind that M1 Funsters like me are running 220gn '06 slugs at 2425fps thru 16.1" Mini-Gs, and luvin' the fuk outta it.  'Course anyone with a Mini-G is also running the most-awesome Schuster M1 adjustable gas plug, so KABOOM-ski! issues are, well, ... non-issues.  Sounds like a sort of CYA/word-to-the-wise from CMP for those shooting that hot-ish HXP through their '70-year old' warhorse. Or playing around with heavier than 150gn bullets in their handloads. Just run the Schuster plug if you're goosey. Not like they're making more factory-new M1s, and prices on these old dogs are rising quickly, dontcha know.  Word. 
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Posted: 4/20/2021 7:45:14 PM EDT
[#5]
Quote HistoryQuoted: Yeah Hoooo boy! Sounds like ol'Jeremy just got schooled. LOL! Quote HistoryQuoted: Yeah Hoooo boy! Sounds like ol'Jeremy just got schooled. LOL! If thats what you think...I suggest learning how to read english correctly. Quoted: Link sez ammo pressure limit for 'Garand-Safe' .30-06 is 50K C.U.P. limit ... or else possible KABOOM-ski! Yep...50k CUP is SAAMI max pressure for 30-06... I agree don't shoot over SAAMI spec ammo...but since commercial ammo is made to SAAMI spec we don't have to worry about that according to CMP :D Quoted: I think CMP got wind that M1 Funsters like me are running 220gn '06 slugs at 2425fps thru 16.1" Mini-Gs, and luvin' the fuk outta it. 'Course anyone with a Mini-G is also running the most-awesome Schuster M1 adjustable gas plug, so KABOOM-ski! issues are, well, ... non-issues. Sounds like a sort of CYA/word-to-the-wise from CMP for those shooting that hot-ish HXP through their '70-year old' warhorse. Or playing around with heavier than 150gn bullets in their handloads. Just run the Schuster plug if you're goosey. Not like they're making more factory-new M1s, and prices on these old dogs are rising quickly, dontcha know. Word. The other thing worth mentioning....is if CMP says 50k CUP is max pressure for garands....will they stop selling .308 garands? SAAMI max pressure for 308 is..... wait for it.... 52k CUP! 
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Posted: 4/20/2021 7:54:46 PM EDT
[#6]
Quote HistoryQuoted: No problem here... CMP and I agree on this. They just said that commercial ammo is fine. Quote HistoryQuoted: No problem here... CMP and I agree on this. They just said that commercial ammo is fine. Commericial ammo with a bullet weight under 172-174 grains. Quoted: The other thing worth mentioning....is if CMP says 50k CUP is max pressure for garands....will they stop selling .308 garands? They said not to fire 30-06 ammunition that is over 50k in Garands. So don't fire 30-06 ammunition over 50k in a .308 Garand and you'll be fine. |
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Posted: 4/20/2021 7:58:44 PM EDT
[#7]
Quote HistoryQuoted: Commericial ammo with a bullet weight under 172-174 grains. They said not to fire 30-06 ammunition that is over 50k in Garands. So don't fire 30-06 ammunition over 50k in a .308 Garand and you'll be fine. when read properly it says this.. They said ammo that is OVER 50k CUP AND 172 gr is bad. However... 50k CUP is SAAMI max so ALL commercial ammo is under this. In essence CMP just stated all commercial ammo is fine. Only the 172gr limit applied if it was OVER SAAMI spec. RE: 308... if over 50k is UNSAFE in 30-06 why is it SAFE to shoot 52k in a 308? |
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Posted: 4/20/2021 8:26:13 PM EDT
[#8]
Quote HistoryQuoted: You are missing what was sent out... when read properly it says this.. They said ammo that is OVER 50k CUP AND 172 gr is bad. However... 50k CUP is SAAMI max so ALL commercial ammo is under this. In essence CMP just stated all commercial ammo is fine. Only the 172gr limit applied if it was OVER SAAMI spec. Quote HistoryQuoted: You are missing what was sent out... when read properly it says this.. They said ammo that is OVER 50k CUP AND 172 gr is bad. However... 50k CUP is SAAMI max so ALL commercial ammo is under this. In essence CMP just stated all commercial ammo is fine. Only the 172gr limit applied if it was OVER SAAMI spec. Isn't 50k the max average, not absolute max? IE, variations in commercial ammunition could be as high as 53k, so don't use ammunition loaded to SAAMI specs with bullets of that weight? IOW, I was reading it as "don't use ammunition that might exceed 50k with bullets over 172". Otherwise, they wouldn't they just say "use ammunition loaded to SAAMI specifications"? RE: 308... if over 50k is UNSAFE in 30-06 why is it SAFE to shoot 52k in a 308? .308 Garand barrels seem to have a larger gas port than 30-06 ones. Which would suggest a lower pressure at that point when shooting 308 than 30-06. Not sure if that is due to different powders or the smaller case size though. |
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Posted: 4/20/2021 8:35:01 PM EDT
[#9]
Quote HistoryQuoted: Isn't 50k the max average, not absolute max? IE, variations in commercial ammunition could be as high as 53k, so don't use ammunition loaded to SAAMI specs with bullets of that weight? IOW, I was reading it as "don't use ammunition that might exceed 50k with bullets over 172". Otherwise, they wouldn't they just say "use ammunition loaded to SAAMI specifications"? .308 Garand barrels seem to have a larger gas port than 30-06 ones. Which would suggest a lower pressure at that point when shooting 308 than 30-06. Not sure if that is due to different powders or the smaller case size though. Quote HistoryQuoted: Quoted: You are missing what was sent out... when read properly it says this.. They said ammo that is OVER 50k CUP AND 172 gr is bad. However... 50k CUP is SAAMI max so ALL commercial ammo is under this. In essence CMP just stated all commercial ammo is fine. Only the 172gr limit applied if it was OVER SAAMI spec. Isn't 50k the max average, not absolute max? IE, variations in commercial ammunition could be as high as 53k, so don't use ammunition loaded to SAAMI specs with bullets of that weight? IOW, I was reading it as "don't use ammunition that might exceed 50k with bullets over 172". Otherwise, they wouldn't they just say "use ammunition loaded to SAAMI specifications"? RE: 308... if over 50k is UNSAFE in 30-06 why is it SAFE to shoot 52k in a 308? .308 Garand barrels seem to have a larger gas port than 30-06 ones. Which would suggest a lower pressure at that point when shooting 308 than 30-06. Not sure if that is due to different powders or the smaller case size though. 308s require more gas since they have less case capacity. But the 50k CUP pressure mentioned in the email is specifically CHAMBER pressure.... chamber pressure is not an indicator of safe "PORT" pressure. |
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Posted: 4/20/2021 9:04:57 PM EDT
[#10]
Quote HistoryQuoted: I'm thinking CMP didn't understand what they were writing when trying to say something else.... if thats the case I question the person who wrote its abilty to discus the garand in detail. Quote HistoryQuoted: I'm thinking CMP didn't understand what they were writing when trying to say something else.... if thats the case I question the person who wrote its abilty to discus the garand in detail. That could very well be. 308s require more gas since they have less case capacity. But the 50k CUP pressure mentioned in the email is specifically CHAMBER pressure.... chamber pressure is not an indicator of safe "PORT" pressure. Ideal gas law would mean the smaller initial volume would result in a lower pressure at the gas port since the amount of barrel volume before the gas port would be the same (the two barrels have the same inside dimensions past the chamber). 30-06 cartridge volume is ~4.4 ml and a .308 is ~3.6 ml. Which means the 308 has about 82% the case capacity. A rough figure for the barrel volume before the gas port is 23.2 ml. All else being equal*, the 308 gas pressure would dissipate to about 13.4% of the chamber pressure. The 30-06 would dissipate to about 16% of the chamber pressure. 13.4% of 52k is 6,968 and 16% of 50k is 8k, so the 308 would appear to have significantly lower pressure at the gas port. Granted this takes a lot of assumptions and CUP is not the same as PSI, but the reduced pressure of the 308 would jive with the larger gas port. AIUI, the issue with too high of pressures is not the pressure itself, but the spike of pressure and the impulse that imparts on the op rod. The lower numbers of the 308 would seem to mitigate that spike of pressure. * Assume a frictionless Garand on an infinite plane. |
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Posted: 4/20/2021 9:07:36 PM EDT
[#11]
Quote HistoryQuoted: That could very well be. Ideal gas law would mean the smaller initial volume would result in a lower pressure at the gas port since the amount of barrel volume before the gas port would be the same (the two barrels have the same inside dimensions past the chamber). 30-06 cartridge volume is ~4.4 ml and a .308 is ~3.6 ml. Which means the 308 has about 82% the case capacity. A rough figure for the barrel volume before the gas port is 23.2 ml. All else being equal*, the 308 gas pressure would dissipate to about 13.4% of the chamber pressure. The 30-06 would dissipate to about 16% of the chamber pressure. 13.4% of 52k is 6,968 and 16% of 50k is 8k, so the 308 would appear to have significantly lower pressure at the gas port. Granted this takes a lot of assumptions and CUP is not the same as PSI, but the reduced pressure of the 308 would jive with the larger gas port. AIUI, the issue with too high of pressures is not the pressure itself, but the spike of pressure and the impulse that imparts on the op rod. The lower numbers of the 308 would seem to mitigate that spike of pressure. * Assume a frictionless Garand on an infinite plane. 308 is from .095 to .101 or so..it varies. |
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Posted: 4/20/2021 9:41:15 PM EDT
[#12]
Quote HistoryQuoted: If thats what you think...I suggest learning how to read english correctly. Yep...50k CUP is SAAMI max pressure for 30-06... I agree don't shoot over SAAMI spec ammo...but since commercial ammo is made to SAAMI spec we don't have to worry about that according to CMP :D The other thing worth mentioning....is if CMP says 50k CUP is max pressure for garands....will they stop selling .308 garands? SAAMI max pressure for 308 is..... wait for it.... 52k CUP! people who have been to the stores say otherwise but I've seen posts from CMP on their forums saying they have no plans to offer more .308 Garands. Maybe this was why. |
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Posted: 4/20/2021 9:44:17 PM EDT
[#13]
Quote HistoryQuoted: people who have been to the stores say otherwise but I've seen posts from CMP on their forums saying they have no plans to offer more .308 Garands. Maybe this was why. Its probably a supply demand issue....not 2k CUP difference...which isn't a big deal at all. |
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Posted: 4/20/2021 10:31:26 PM EDT
[#14]
Quote HistoryQuoted: Not likely....otherwise Navy Mk2s and BM59s and Garand Tipo 2s wouldn't exist. Its probably a supply demand issue....not 2k CUP difference...which isn't a big deal at all. Quote HistoryQuoted: Quoted: people who have been to the stores say otherwise but I've seen posts from CMP on their forums saying they have no plans to offer more .308 Garands. Maybe this was why. Its probably a supply demand issue....not 2k CUP difference...which isn't a big deal at all. People seem to be screaming for .308 M1s, and they're built around new made barrels. The supply should be as simple as ordering a batch. "Ream the chambers of the barrels in order number 87 to .308 please". But they don't. ETA-and thw Navy rifles and Tipo 2s aren't current CMP builds. |
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Posted: 4/20/2021 11:08:04 PM EDT
[#15]
Quote HistoryQuoted: ETA-and thw Navy rifles and Tipo 2s aren't current CMP builds. |
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Posted: 4/20/2021 11:26:14 PM EDT
[#16]
This is disappointing.
Lots of posts, including discussions of ideal gas law, and yet not one insult, claim about a person's linage, or challenges to a duel. C'mon people, we're talking about what ammo could make an M1 blow up. It's time to get nasty and personal! |
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Posted: 4/20/2021 11:50:39 PM EDT
[#17]
Quote HistoryQuoted: This is disappointing. Lots of posts, including discussions of ideal gas law, and yet not one insult, claim about a person's linage, or challenges to a duel. C'mon people, we're talking about what ammo could make an M1 blow up. It's time to get nasty and personal! |
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Posted: 4/21/2021 7:03:07 AM EDT
[#18]
Quoted: This is disappointing. Lots of posts, including discussions of ideal gas law, and yet not one insult, claim about a person's linage, or challenges to a duel. C'mon people, we're talking about what ammo could make an M1 blow up. It's time to get nasty and personal! There has been plenty of pissing contests over on the CMP M1 Garand forum if you have to have it. |
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Posted: 4/21/2021 7:09:19 AM EDT
[#19]
I have a crate of M2 Ball, and 2K rounds of Greek HXP.
I think I'm fine for the foreseeable future. |
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Posted: 4/21/2021 7:35:45 AM EDT
[#20]
Quote HistoryQuoted: This is disappointing. Lots of posts, including discussions of ideal gas law, and yet not one insult, claim about a person's linage, or challenges to a duel. C'mon people, we're talking about what ammo could make an M1 blow up. It's time to get nasty and personal! LOL!  But on a serious point, it would be a sad day if CMP won't build any of those RG or FG Specials with .308 Criterion barrels anymore because of C.U.P. concerns. Even with the pitted receivers, those M1s would make for great shooters. About six years or so ago at the Nat'l Matches, I bought a .308 M1 built on an HRA receiver using a Criterion tube. I think CMP called this run the 'Special Receivers,' as they were also selling some built on S.A. receivers. Both types used unpitted Grade 2 condition receivers. Both were also sold stocked in new Dupage wood. All other parts were USGI. Basically you got a Service Grade-level 308 M1 for just under $1K. Great looking rifle, and it's probably my best shooter. Very sad if they won't be building more .308s due to C.U.P. fears. |
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Posted: 4/21/2021 7:41:31 AM EDT
[#21]
Quote HistoryQuoted: Very sad if they won't be building more .308s due to C.U.P. fears. Quote HistoryQuoted: Very sad if they won't be building more .308s due to C.U.P. fears. |
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Posted: 4/21/2021 7:51:31 AM EDT
[#22]
I think they have had a ton of new buyers, lots of questions (caused by M2 ammo shortage), and they are trying to get ahead of that wave before it starts.
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Posted: 4/21/2021 8:01:58 AM EDT
[#23]
Quote HistoryQuoted: I think they have had a ton of new buyers, lots of questions (caused by M2 ammo shortage), and they are trying to get ahead of that wave before it starts. Can you imagine the google hits for CUP pressure ammo now? Thats all thats over FB...how do I find out the CUP of my ammo..is it safe?? blah blah... Thanks CMP...turd in the punchbowl with that email... |
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Posted: 4/21/2021 9:24:30 AM EDT
[#24]
Quote HistoryQuoted: maybe so...but that email is horribly worded and basically "extremely confusing" for ANY new shooter. Can you imagine the google hits for CUP pressure ammo now? Thats all thats over FB...how do I find out the CUP of my ammo..is it safe?? blah blah... Thanks CMP...turd in the punchbowl with that email... Quote HistoryQuoted: Quoted: I think they have had a ton of new buyers, lots of questions (caused by M2 ammo shortage), and they are trying to get ahead of that wave before it starts. Can you imagine the google hits for CUP pressure ammo now? Thats all thats over FB...how do I find out the CUP of my ammo..is it safe?? blah blah... Thanks CMP...turd in the punchbowl with that email... Yeah I agree the Warning wasn't particularly well-written. It will be interesting to see if CMP provides any follow-ups or 'clarifications' to what they were trying to say in the Warning. No doubt they're probably getting a lotta emails with questions. |
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Posted: 4/21/2021 10:27:46 AM EDT
[#25]
Quote HistoryQuoted: People seem to be screaming for .308 M1s, and they're built around new made barrels. The supply should be as simple as ordering a batch. "Ream the chambers of the barrels in order number 87 to .308 please". But they don't. ETA-and thw Navy rifles and Tipo 2s aren't current CMP builds. There are no specials of any caliber available on their website and their gunsmithing is limited to 15 orders per week. I'd guess they are concentrating most of their people on disassembly, inspection, and reassembly of "stock" Garands and not on the higher workload items like rebarreling. |
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Posted: 4/21/2021 1:34:19 PM EDT
[#26]
Quote HistoryQuoted: LOL! But on a serious point, it would be a sad day if CMP won't build any of those RG or FG Specials with .308 Criterion barrels anymore because of C.U.P. concerns. Even with the pitted receivers, those M1s would make for great shooters. About six years or so ago at the Nat'l Matches, I bought a .308 M1 built on an HRA receiver using a Criterion tube. I think CMP called this run the 'Special Receivers,' as they were also selling some built on S.A. receivers. Both types used unpitted Grade 2 condition receivers. Both were also sold stocked in new Dupage wood. All other parts were USGI. Basically you got a Service Grade-level 308 M1 for just under $1K. Great looking rifle, and it's probably my best shooter. Very sad if they won't be building more .308s due to C.U.P. fears. That's the M1 Garand I have - the new .308 barrel, new stock, and I got a 1944 Springfield receiver that looked about brand new. Great shooter, and a great rifle. If you're not hooked on 30/06 for whatever reason, it's a better rifle to get due to wider ammo availability and lots of mil spec surplus rounds to blast with. |
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Posted: 4/21/2021 5:26:07 PM EDT
[#27]
SAAMI switched 30-06 pressure specs from CUP to transducer PSI in 1992.
CIP switched in 2002. |
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Posted: 5/10/2021 9:32:30 AM EDT
[#28]
A warning so simple, it is confusing.
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Posted: 5/10/2021 9:45:54 AM EDT
[#29]
Self-edited: Duped myself...
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Posted: 5/10/2021 10:14:40 AM EDT
[#30]
Quote HistoryQuoted: A warning so simple, it is confusing. |
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Posted: 5/10/2021 10:40:34 AM EDT
[#31]
tomato tomato
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Posted: 5/11/2021 7:25:16 AM EDT
[#32]
A Schuster’s adjustable gas plug is cheap insurance.
It also allows the use of modern ammo without the worry. |
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Posted: 5/11/2021 9:32:40 AM EDT
[#33]
Quote HistoryQuoted: A Schuster's adjustable gas plug is cheap insurance. It also allows the use of modern ammo without the worry. Besides CMPs "warning" just said commercial ammo is fine. |
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Posted: 5/11/2021 4:31:12 PM EDT
[#34]
Quote HistoryQuoted: A Schuster’s adjustable gas plug is cheap insurance. It also allows the use of modern ammo without the worry. In personal conversation with Tim, the Head Dude @ Shuff's Parkerizing, he said he's sent a whole passel of 16.1" Mini-Gs to his Alaskan clients. All run the most-awesome Schuster M1 adjustable gas plug. While most of these AK-bound Minis are chambered in .30-06, and a few in .308, more than just a few are chambered in, .... [wait for it] ... .35 Whelen. For the unawares and you 'youngins' out there, the .35W cartridge is a 30-06 necked up,to.35-cal. Tim said there's at least two .35W Minis in use on Kodiak Isl. They're kicking ass and taking names, or would be taking names if bruins had names. Example here: https://www.gulfcoastgunforum.com/threads/shuffs-parkerizing-mini-g-in-35-whelen.25256/ 
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Posted: 5/11/2021 7:29:33 PM EDT
[#35]
Quote HistoryQuoted: In personal conversation with Tim, the Head Dude @ Shuff's Parkerizing, he said he's sent a whole passel of 16.1" Mini-Gs to his Alaskan clients. All run the most-awesome Schuster M1 adjustable gas plug. While most of these AK-bound Minis are chambered in .30-06, and a few in .308, more than just a few are chambered in, .... [wait for it] ... .35 Whelen. For the unawares and you 'youngins' out there, the .35W cartridge is a 30-06 necked up,to.35-cal. Tim said there's at least two .35W Minis in use on Kodiak Isl. They're kicking ass and taking names, or would be taking names if bruins had names. But for a bone stock garand gas system...not needed. |
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Posted: 5/11/2021 8:31:01 PM EDT
[#36]
Quote HistoryQuoted: In personal conversation with Tim, the Head Dude @ Shuff's Parkerizing, he said he's sent a whole passel of 16.1" Mini-Gs to his Alaskan clients. All run the most-awesome Schuster M1 adjustable gas plug. While most of these AK-bound Minis are chambered in .30-06, and a few in .308, more than just a few are chambered in, .... [wait for it] ... .35 Whelen. For the unawares and you 'youngins' out there, the .35W cartridge is a 30-06 necked up,to.35-cal. Tim said there's at least two .35W Minis in use on Kodiak Isl. They're kicking ass and taking names, or would be taking names if bruins had names. Example here: https://www.gulfcoastgunforum.com/threads/shuffs-parkerizing-mini-g-in-35-whelen.25256/ Imagine a Mini-G in 9.3X62. |
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Posted: 5/12/2021 6:50:46 AM EDT
[#37]
Quote HistoryQuoted: Imagine a Mini-G in 9.3X62. Quote HistoryQuoted: Quoted: In personal conversation with Tim, the Head Dude @ Shuff's Parkerizing, he said he's sent a whole passel of 16.1" Mini-Gs to his Alaskan clients. All run the most-awesome Schuster M1 adjustable gas plug. While most of these AK-bound Minis are chambered in .30-06, and a few in .308, more than just a few are chambered in, .... [wait for it] ... .35 Whelen. For the unawares and you 'youngins' out there, the .35W cartridge is a 30-06 necked up,to.35-cal. Tim said there's at least two .35W Minis in use on Kodiak Isl. They're kicking ass and taking names, or would be taking names if bruins had names. Example here: https://www.gulfcoastgunforum.com/threads/shuffs-parkerizing-mini-g-in-35-whelen.25256/ Imagine a Mini-G in 9.3X62. Yes, I think someone did put together one in that chambering. Might've been a Canadian dude, IIRC. Not surprising though, as someone built up a few M1s in .458 Winchester Magnum. Lots of mods went into that set-up of course, but it held 5- or 6-rds and ran fine. https://www.thefirearmblog.com/blog/2015/07/06/oood-mccann-industries-458-win-mag-garand/ |
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Posted: 6/20/2021 6:31:17 AM EDT
[#38]
Any thoughts on the Garand Gear ported gas plug? My supply of HXP is running low. I know Privi and a few others make a Garand load but I wouldn’t mind being able to shoot a modern hunting round out of my Garands.
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Posted: 6/20/2021 7:32:28 AM EDT
[#39]
Quote HistoryQuoted: Any thoughts on the Garand Gear ported gas plug? My supply of HXP is running low. I know Privi and a few others make a Garand load but I wouldn't mind being able to shoot a modern hunting round out of my Garands. The current interpretation is that previous concerns about commercial 30-06 were overly cautious ( or based on misinterpretations ~= as with 7.62x54 vs .308 IMO  ). Making such modifications unnecessary for ammo within the SAAMI spec for 30-06. All the same, a high-volume gas plug is interesting to me. So long as the rifle runs reliably I will give it a try. |
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Posted: 6/20/2021 8:44:21 AM EDT
[#40]
Quote HistoryQuoted: Any thoughts on the Garand Gear ported gas plug? My supply of HXP is running low. I know Privi and a few others make a Garand load but I wouldn’t mind being able to shoot a modern hunting round out of my Garands. I've used one. I don't see any negatives with it. |
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Posted: 6/20/2021 12:10:02 PM EDT
[#41]
Quote HistoryQuoted: Any thoughts on the Garand Gear ported gas plug? My supply of HXP is running low. I know Privi and a few others make a Garand load but I wouldn't mind being able to shoot a modern hunting round out of my Garands. |
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Posted: 6/20/2021 12:28:27 PM EDT
[#42]
Load up till it functions in cold weather and then stop.
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Posted: 6/21/2021 7:40:46 AM EDT
[#43]
Quote HistoryQuoted: Any thoughts on the Garand Gear ported gas plug? My supply of HXP is running low. I know Privi and a few others make a Garand load but I wouldn’t mind being able to shoot a modern hunting round out of my Garands. There's also Schuster Mfg. which offers two types of plugs: adjustable and non-adjustable. With the adj. plug, you simply tune your rifle by adjusting the internal screw incrementally until it runs reliably with whatever specific factory ammo or handload you're shooting. Literally, you're tuning the M1's gas system to safely run that ammo. That could be heavy 'hunting' '06 type ammo, like Remmy's 220gn Corelokt stuff, or a hot handload using 180gn, 200gn, or 220gn bear-smackin' slugs. Schuster' non-adj. plug is a high volume type that reduces the gas by a set amount. Check their website for what that is. It's designed for use in a full-size M1, but I use it in my 18.5" 'Tanker' (in '06) and it runs fine. ... My 16.1" Mini-G carbine was set up by Shuff's Parkerizing to run with the adj. plug. It too runs great. |
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Posted: 6/21/2021 9:49:23 AM EDT
[#44]
For the record...a full size garand doesn't need any gas adjustments.
Shorter ones however do. Interesting tidbit. Fed 220gr operates at the same pressure as garand safe ammo. So don't believe everything you see about commercial ammo being unsafe. |
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Posted: 6/21/2021 12:24:57 PM EDT
[#45]
Quote HistoryQuoted: For the record...a full size garand doesn't need any gas adjustments. Shorter ones however do. Interesting tidbit. Fed 220gr operates at the same pressure as garand safe ammo. So don't believe everything you see about commercial ammo being unsafe. I dont think it's the gross pressure that's the issue. Its the pressure curve and dwell time at the port. Heavy bullets use slow powders. Slow powders have too much pressure and dwell time of that pressure at the port. Thus forcing the op rod back too hard for too long. |
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Posted: 6/21/2021 1:07:05 PM EDT
[#46]
Quote HistoryQuoted: Heavy bullets use slow powders. Slow powders have too much pressure and dwell time of that pressure at the port. Thus forcing the op rod back too hard for too long. Which rifle below is shooting Fed 220s and which one is shooting garand safe ammo? https://i.imgur.com/q3c25cs.mp4 
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Posted: 6/21/2021 2:33:22 PM EDT
[#47]
Quote HistoryQuoted: That is a misconception... Which rifle below is shooting Fed 220s and which one is shooting garand safe ammo? https://i.imgur.com/q3c25cs.mp4 http://i.imgur.com/q3c25cs.mp4 Quote HistoryQuoted: Quoted: Heavy bullets use slow powders. Slow powders have too much pressure and dwell time of that pressure at the port. Thus forcing the op rod back too hard for too long. Which rifle below is shooting Fed 220s and which one is shooting garand safe ammo? https://i.imgur.com/q3c25cs.mp4 http://i.imgur.com/q3c25cs.mp4 Where's the gauge showing the pressure at the gas port? By the time the bolt starts to move the gas is already past the port, so bolt speed has nothing to do with port pressure. |
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Posted: 6/21/2021 2:43:15 PM EDT
[#48]
I just ordered one of these:
https://m1thumbsavers.square.site/product/m1-garand-ported-gas-plug/4?cs=true&cst=custom Anyone have any practical experience with them?? Seems like relatively cheap insurance. |
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Posted: 6/21/2021 4:17:45 PM EDT
[#49]
Quote HistoryQuoted: Where's the gauge showing the pressure at the gas port? By the time the bolt starts to move the gas is already past the port, so bolt speed has nothing to do with port pressure. Quote HistoryQuoted: Quoted: Quoted: Heavy bullets use slow powders. Slow powders have too much pressure and dwell time of that pressure at the port. Thus forcing the op rod back too hard for too long. Which rifle below is shooting Fed 220s and which one is shooting garand safe ammo? https://i.imgur.com/q3c25cs.mp4 http://i.imgur.com/q3c25cs.mp4 Where's the gauge showing the pressure at the gas port? By the time the bolt starts to move the gas is already past the port, so bolt speed has nothing to do with port pressure. When the bolt is moving the same speed with different loads then the operating pressure is similar between the two loads... |
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Posted: 6/21/2021 4:19:20 PM EDT
[#50]
Quote HistoryQuoted: I just ordered one of these: https://m1thumbsavers.square.site/product/m1-garand-ported-gas-plug/4?cs=true&cst=custom Anyone have any practical experience with them?? Seems like relatively cheap insurance. |
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