User Panel
[#1]
I have a bunch of 80 and 90 grainers waiting on a barrel.
Anything from 14.5" and up would be great. Can not SBR where I live, but can mount a extended muzzle device of a 14.5" barrel Hey I own page three, does that mean I get a barrel? |
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[#2]
Quoted:
I have a bunch of 80 and 90 grainers waiting on a barrel. Anything from 14.5" and up would be great. Can not SBR where I live, but can mount a extended muzzle device of a 14.5" barrel Hey I own page three, does that mean I get a barrel? View Quote Why yes, as a matter of fact it does, just email or IM me your address. Thanks, Rick |
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[#4]
OK, replied to all IM's, thanks. I think that's all for barrels until the 10.5" are done in January.
Thanks Rick |
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[#5]
This there a set of testing procedures you would like us to follow or a method of recording our finding?
Make it a bit easier on you to decipher all the data. Thanks again! |
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[#6]
Quoted:
This there a set of testing procedures you would like us to follow or a method of recording our finding? Make it a bit easier on you to decipher all the data. Thanks again! View Quote I'm planning to try every type of ammo that I can get, but I'm curious about this also. I'm using 55gr .223, M193, M855 and 77gr stuff off the shelf. I might order some 90gr if I can find it. I'll be testing at 50, 100 and hopefully 200 yards if I can find a shot that long around here. |
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[#7]
Quoted:
I'm planning to try every type of ammo that I can get, but I'm curious about this also. I'm using 55gr .223, M193, M855 and 77gr stuff off the shelf. I'll order some 90gr if I can find it. View Quote View All Quotes View All Quotes Quoted:
Quoted:
This there a set of testing procedures you would like us to follow or a method of recording our finding? Make it a bit easier on you to decipher all the data. Thanks again! I'm planning to try every type of ammo that I can get, but I'm curious about this also. I'm using 55gr .223, M193, M855 and 77gr stuff off the shelf. I'll order some 90gr if I can find it. My intentions are to do test at 50,100,200 and 300 yards. I will be doing a base comparison of a 14.5" green mountain barrel i have in 1:7 as well as comparing to a stainless 1:7 that i have had good results with. I will be doing 5 shot groups with 62,69,75, and 77 grain projectiles from each of the barrels and comparing accuracy at the varying distances from a led sled to remove operator error. I will then do a fast test with 30 rounds of both m193, and m855 (they are the most common people tend to stock up on) to see if any issues are experienced with the lighter grain projectiles. The recommended twist during initial testing for m193 was 1:9 and 1:8 for m855. I would like to see if the faster rate is too much for these. I am currently out of m856 but would like to do a few test as well, because the original test called for a faster than 1:7 twist, but the 1:7 was the compromise between the 1:8 and 1:6 recommended for it. |
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[#8]
Quoted: My intentions are to do test at 50,100,200 and 300 yards. I will be doing a base comparison of a 14.5" green mountain barrel i have in 1:7 as well as comparing to a stainless 1:7 that i have had good results with. I will be doing 5 shot groups with 62,69,75, and 77 grain projectiles from each of the barrels and comparing accuracy at the varying distances from a led sled to remove operator error. I will then do a fast test with 30 rounds of both m193, and m855 (they are the most common people tend to stock up on) to see if any issues are experienced with the lighter grain projectiles. The recommended twist during initial testing for m193 was 1:9 and 1:8 for m855. I would like to see if the faster rate is too much for these. I am currently out of m856 but would like to do a few test as well, because the original test called for a faster than 1:7 twist, but the 1:7 was the compromise between the 1:8 and 1:6 recommended for it. View Quote View All Quotes View All Quotes Quoted: Quoted: Quoted: This there a set of testing procedures you would like us to follow or a method of recording our finding? Make it a bit easier on you to decipher all the data. Thanks again! I'm planning to try every type of ammo that I can get, but I'm curious about this also. I'm using 55gr .223, M193, M855 and 77gr stuff off the shelf. I'll order some 90gr if I can find it. My intentions are to do test at 50,100,200 and 300 yards. I will be doing a base comparison of a 14.5" green mountain barrel i have in 1:7 as well as comparing to a stainless 1:7 that i have had good results with. I will be doing 5 shot groups with 62,69,75, and 77 grain projectiles from each of the barrels and comparing accuracy at the varying distances from a led sled to remove operator error. I will then do a fast test with 30 rounds of both m193, and m855 (they are the most common people tend to stock up on) to see if any issues are experienced with the lighter grain projectiles. The recommended twist during initial testing for m193 was 1:9 and 1:8 for m855. I would like to see if the faster rate is too much for these. I am currently out of m856 but would like to do a few test as well, because the original test called for a faster than 1:7 twist, but the 1:7 was the compromise between the 1:8 and 1:6 recommended for it. I'll compare chrono data from all the loads/barrels as well. I have 1:9 10.5", 1:9 20", 1:7 14.5", and 1:7 18" to compare chrono data and 50-100 accuracy testing. |
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[#10]
Quoted:
I'm planning to do accuracy at 50 and 100-600 yards. I'll use M193, M855, my 77gSMK MK262 clone load, and some 80g . I'm skipping on the 90g since it's sort of pointless unless you're going for NM type loadings, which are useless to most of us. I'll compare chrono data from all the loads/barrels as well. I have 1:9 10.5", 1:9 20", 1:7 14.5", and 1:7 18" to compare chrono data and 50-100 accuracy testing. View Quote View All Quotes View All Quotes Quoted:
Quoted:
Quoted:
Quoted:
This there a set of testing procedures you would like us to follow or a method of recording our finding? Make it a bit easier on you to decipher all the data. Thanks again! I'm planning to try every type of ammo that I can get, but I'm curious about this also. I'm using 55gr .223, M193, M855 and 77gr stuff off the shelf. I'll order some 90gr if I can find it. My intentions are to do test at 50,100,200 and 300 yards. I will be doing a base comparison of a 14.5" green mountain barrel i have in 1:7 as well as comparing to a stainless 1:7 that i have had good results with. I will be doing 5 shot groups with 62,69,75, and 77 grain projectiles from each of the barrels and comparing accuracy at the varying distances from a led sled to remove operator error. I will then do a fast test with 30 rounds of both m193, and m855 (they are the most common people tend to stock up on) to see if any issues are experienced with the lighter grain projectiles. The recommended twist during initial testing for m193 was 1:9 and 1:8 for m855. I would like to see if the faster rate is too much for these. I am currently out of m856 but would like to do a few test as well, because the original test called for a faster than 1:7 twist, but the 1:7 was the compromise between the 1:8 and 1:6 recommended for it. I'll compare chrono data from all the loads/barrels as well. I have 1:9 10.5", 1:9 20", 1:7 14.5", and 1:7 18" to compare chrono data and 50-100 accuracy testing. Would not mind having a 1/6 twist 22-250 barrel for 90 grainers. Popping 3200 FPS with 80 SMKs out of a 24" tube. But that is completely off topic. |
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[#11]
I'll test a 10.5 when ready. I have an SBR lower that wouldn't be an issue
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[#12]
Quoted:
I'm planning to do accuracy at 50 and 100-600 yards. I'll use M193, M855, my 77gSMK MK262 clone load, and some 80g . I'm skipping on the 90g since it's sort of pointless unless you're going for NM type loadings, which are useless to most of us. I'll compare chrono data from all the loads/barrels as well. I have 1:9 10.5", 1:9 20", 1:7 14.5", and 1:7 18" to compare chrono data and 50-100 accuracy testing. View Quote View All Quotes View All Quotes Quoted:
Quoted:
Quoted:
Quoted:
This there a set of testing procedures you would like us to follow or a method of recording our finding? Make it a bit easier on you to decipher all the data. Thanks again! I'm planning to try every type of ammo that I can get, but I'm curious about this also. I'm using 55gr .223, M193, M855 and 77gr stuff off the shelf. I'll order some 90gr if I can find it. My intentions are to do test at 50,100,200 and 300 yards. I will be doing a base comparison of a 14.5" green mountain barrel i have in 1:7 as well as comparing to a stainless 1:7 that i have had good results with. I will be doing 5 shot groups with 62,69,75, and 77 grain projectiles from each of the barrels and comparing accuracy at the varying distances from a led sled to remove operator error. I will then do a fast test with 30 rounds of both m193, and m855 (they are the most common people tend to stock up on) to see if any issues are experienced with the lighter grain projectiles. The recommended twist during initial testing for m193 was 1:9 and 1:8 for m855. I would like to see if the faster rate is too much for these. I am currently out of m856 but would like to do a few test as well, because the original test called for a faster than 1:7 twist, but the 1:7 was the compromise between the 1:8 and 1:6 recommended for it. I'll compare chrono data from all the loads/barrels as well. I have 1:9 10.5", 1:9 20", 1:7 14.5", and 1:7 18" to compare chrono data and 50-100 accuracy testing. The 90's don't look very promising but there are quite a few 80+ that we could try. Would we want to get a list of who tries what round, and a standard testing procedure? That way it will be somewhat uniform. I'll load whatever, but have 16" 1:9, 1:7 and waiting on a 1:8 from BF to try against the 1:6. The main things I am worried about are mag length, lack of load data, and of course these super fast twist rates tearing up the jackets of bullets. Hence why solid coppers (along with their lengths) will gain heavily. I read online that there is a formula to determine twist rate----Twist = (C x [Bullet Diameter in Inches, Squared]) / [Length of Bullet in Inches] Where “C” is 150 when the velocity is under 2,800 feet per second, and 180 when above. There’s some extra bits that are thrown in when you don’t have a lead core projectile, but that’s the basics. This formula can be used to either figure out the ideal twist for a given projectile, or figure out what the ideal length of projectile for a given twist is. ---- |
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[#13]
Quoted: The 90's don't look very promising but there are quite a few 80+ that we could try. Would we want to get a list of who tries what round, and a standard testing procedure? That way it will be somewhat uniform. I'll load whatever, but have 16" 1:9, 1:7 and waiting on a 1:8 from BF to try against the 1:6. The main things I am worried about are mag length, lack of load data, and of course these super fast twist rates tearing up the jackets of bullets. Hence why solid coppers (along with their lengths) will gain heavily. I read online that there is a formula to determine twist rate----Twist = (C x [Bullet Diameter in Inches, Squared]) / [Length of Bullet in Inches] Where "C” is 150 when the velocity is under 2,800 feet per second, and 180 when above. There’s some extra bits that are thrown in when you don’t have a lead core projectile, but that’s the basics. This formula can be used to either figure out the ideal twist for a given projectile, or figure out what the ideal length of projectile for a given twist is. ---- View Quote View All Quotes View All Quotes Quoted: Quoted: Quoted: Quoted: Quoted: This there a set of testing procedures you would like us to follow or a method of recording our finding? Make it a bit easier on you to decipher all the data. Thanks again! I'm planning to try every type of ammo that I can get, but I'm curious about this also. I'm using 55gr .223, M193, M855 and 77gr stuff off the shelf. I'll order some 90gr if I can find it. My intentions are to do test at 50,100,200 and 300 yards. I will be doing a base comparison of a 14.5" green mountain barrel i have in 1:7 as well as comparing to a stainless 1:7 that i have had good results with. I will be doing 5 shot groups with 62,69,75, and 77 grain projectiles from each of the barrels and comparing accuracy at the varying distances from a led sled to remove operator error. I will then do a fast test with 30 rounds of both m193, and m855 (they are the most common people tend to stock up on) to see if any issues are experienced with the lighter grain projectiles. The recommended twist during initial testing for m193 was 1:9 and 1:8 for m855. I would like to see if the faster rate is too much for these. I am currently out of m856 but would like to do a few test as well, because the original test called for a faster than 1:7 twist, but the 1:7 was the compromise between the 1:8 and 1:6 recommended for it. I'll compare chrono data from all the loads/barrels as well. I have 1:9 10.5", 1:9 20", 1:7 14.5", and 1:7 18" to compare chrono data and 50-100 accuracy testing. The 90's don't look very promising but there are quite a few 80+ that we could try. Would we want to get a list of who tries what round, and a standard testing procedure? That way it will be somewhat uniform. I'll load whatever, but have 16" 1:9, 1:7 and waiting on a 1:8 from BF to try against the 1:6. The main things I am worried about are mag length, lack of load data, and of course these super fast twist rates tearing up the jackets of bullets. Hence why solid coppers (along with their lengths) will gain heavily. I read online that there is a formula to determine twist rate----Twist = (C x [Bullet Diameter in Inches, Squared]) / [Length of Bullet in Inches] Where "C” is 150 when the velocity is under 2,800 feet per second, and 180 when above. There’s some extra bits that are thrown in when you don’t have a lead core projectile, but that’s the basics. This formula can be used to either figure out the ideal twist for a given projectile, or figure out what the ideal length of projectile for a given twist is. ---- The 90s aren't that much better than the 80s if we're talking about SMKs. Single loading on both sort of negates the use of them in an AR15 platform other than for NM type comps. And even those guys are staying with the 77SMKs for 600 yards. (at least the ones I speak to) I'll try single loading 80SMKs just for shits and giggles, though the main focus will be 77SMKs and lower to determine and adverse effects on accuracy or bullet stability (breaking apart, excessive yawing, etc) I'll start a thread ***Official Green Mountain Barrel Test*** where we can compile our data. I'll post up a format so guys can add information in a somewhat organized manner. Green Mountain Forum for Barrel Testing Thread <-----Thread |
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[#18]
Guys I'll answer IM's when I back to the shop and on my desk top. It's a bitch to do it on this phone.
Thanks Rick |
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[#19]
Quoted: OK, sorted through the emails and IM's. Looks like I'll have enough barrels for all that want to join in. I didn't get screen names for all and still short a couple addresses. Here's a list so please check that you're here as you may have sent your address but I didn't match it up to a screen name: Stone76245 16" Scorch05 16" (need address) MRW 16" (need address) AR180 16" phylodog 12.5" greyghost 16" Twitchy 16" Skillshot 16" brdvictim 16" (need address) Sputnik556 16" MUAD 14.5" Jaqufrost 14.5" NAVYiS2 14.5" WE-06 12.5" Hatr40 16" 556hunter 14.5" I may have the address but missed the tie in to the screen name. Please email the address with your screen name to me at [email protected] The barrels are in QC and should start shipping out tomorrow. To those that asked, these are basic barrels with no gas blocks installed. I'll be making up some more in the next few weeks, thinking 10.5" and 20". Thanks for joining in! Rick Update: Most all barrels have been shipped, couple more to go out today. 12/3 View Quote Don |
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[#20]
I skimmed this thread since I've shot a lot of the 77s and 80s due to my competitive High Power Rifle background.
For magazine length loads, it doesn't get any better than 77gr Lapua Scenar. Best QC as far as I'm concerned. Meplats are clean and consistent. Sierra and Nosler 77 are essentially equal. A lot of my friends like to shoot Berger 77 (especially since Berger is local; SoCal). |
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[#21]
Great to see people pushing the envelope so to speak. I'd be interested in a short barrel if testing gets that far. I want to build a couple pistols with the Sig brace and 7.5-10" barrels. I was thinking I would have to go 300blackout but a heavier 5.56 bullet might work well. Not sure what powders would work best in that comfig though.
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[#22]
Rick,
Barrel was received. I've got it all put together. Will slap the scope on it this week and get it sighted in for you. The long range test will start within two weeks. |
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[#23]
Barrel received. I'll get this upper put together ASAP, and hit the range.
Cheers.
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[#26]
Barrel received, trying to get a hold of a set screw FSB so that I don't have to send it out for pinning. Hopefully next week.
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[#27]
Quoted: Barrel received, trying to get a hold of a set screw FSB so that I don't have to send it out for pinning. Hopefully next week. View Quote This time I tried a cheap steel gas block from Amazon. I'll have to see how it fits when the barrel shows up. http://www.amazon.com/Rousch%C2%AE-Profile--Black--7-62X39-Blackout/dp/B00OAY354A/ref=sr_1_1?ie=UTF8&qid=1418070944&sr=8-1&keywords=steel+gas+block |
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[#28]
Quoted:
I've had good success with YHM 9383's in the past. This time I tried a cheap steel gas block from Amazon. I'll have to see how it fits when the barrel shows up. http://www.amazon.com/Rousch%C2%AE-Profile--Black--7-62X39-Blackout/dp/B00OAY354A/ref=sr_1_1?ie=UTF8&qid=1418070944&sr=8-1&keywords=steel+gas+block View Quote View All Quotes View All Quotes Quoted:
Quoted:
Barrel received, trying to get a hold of a set screw FSB so that I don't have to send it out for pinning. Hopefully next week. This time I tried a cheap steel gas block from Amazon. I'll have to see how it fits when the barrel shows up. http://www.amazon.com/Rousch%C2%AE-Profile--Black--7-62X39-Blackout/dp/B00OAY354A/ref=sr_1_1?ie=UTF8&qid=1418070944&sr=8-1&keywords=steel+gas+block I don't have any means of free floating so I'm likely going to need an A2 post unfortunately. Thanks though. |
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[#29]
For anyone curious the specs of the barrel I received are:
16" A2 profile (skinny under the handguard) with M203 cut. (Basically an M4 profile without the .700 profile at the muzzle) .750 gas block Carbine gas. |
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[#30]
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[#31]
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[#32]
View Quote If only I handloaded. |
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[#33]
View Quote Ha already orderd. And they have the 77gr OTM SSA for $13/25 if you dont load. |
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[#34]
View Quote |
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[#35]
I got some Berger 90VLD just cause it's 1/6 out of a 16" barrel
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[#39]
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[#41]
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[#42]
Gents,
We have a thread in the GM industry section for the testing and updates. |
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[#43]
It's not bad when you order 15 boxes. Quoted:
Got the 16". Waiting on a gas block. For accuracy testing I was actually thinking about going the single shot route by just inverting the gas block. Then, maybe do some overall reliability testing with rapids. |
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[#45]
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[#46]
Quoted:
Assembled the upper.http://i739.photobucket.com/albums/xx39/jaqufrost/Mobile%20Uploads/2014-12/20141210_205248_zpsvwtq4gbu.jpg View Quote What hand guard is that? |
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[#47]
Quoted:
I don't think you're going to be able to push the 90gr VLD fast enough to make it worthwhile. That's sort of the reason why it never got much traction for 1000 yard service rifle. View Quote View All Quotes View All Quotes Quoted:
Quoted:
I got some Berger 90VLD just cause it's 1/6 out of a 16" barrel I don't think you're going to be able to push the 90gr VLD fast enough to make it worthwhile. That's sort of the reason why it never got much traction for 1000 yard service rifle. Whats the heaviest you can load in a magazine, 80gr vld bergers? |
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[#48]
Quoted: Quoted: Assembled the upper.http://i739.photobucket.com/albums/xx39/jaqufrost/Mobile%20Uploads/2014-12/20141210_205248_zpsvwtq4gbu.jpg What hand guard is that? |
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[#49]
Got my 14.5'' in today and got an upper built up. Should be hitting the range with my 3-9x SWFA this weekend to see how it performs.
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[#50]
Still waiting, but loaded up some 77gr and 80r rounds today. I will also probably try some 45r VMax or similar to see what it does to the light jackets/bullets
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