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Posted: 10/25/2016 7:43:49 PM EDT
[#1]
6.8 spc is very efficient in a 12.5 barrel.
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Posted: 10/25/2016 7:48:58 PM EDT
[#2]
Bill Alexander had some incredible results with hot loads out of a 10.5" barrel in 6.5 grendel.
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Posted: 10/25/2016 8:08:33 PM EDT
[#3]
Quote HistoryQuoted:
Bill Alexander had some incredible results with hot loads out of a 10.5" barrel in 6.5 grendel. Along with the new super strong bolts from that one fella and you could have great (safe) results. Brass is going to take a beating at 60,000 PSI. |
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Posted: 10/25/2016 8:22:43 PM EDT
[#4]
308, 338 fed, 358 winshester
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Posted: 10/25/2016 9:14:47 PM EDT
[#5]
Quote HistoryQuoted:
Along with the new super strong bolts from that one fella and you could have great (safe) results. Brass is going to take a beating at 60,000 PSI. Quote HistoryQuoted:
Quoted:
Bill Alexander had some incredible results with hot loads out of a 10.5" barrel in 6.5 grendel. Along with the new super strong bolts from that one fella and you could have great (safe) results. Brass is going to take a beating at 60,000 PSI. Is the one fella the guy who applies "performance" to the AR platform and can't be named? A Grendel case, loaded to that pressure seems a little sketchy considering the hoop strength of the system is reduced compared to a thinner case. But it it's good to go, that loaded with a 150 8mm would be about what I'm thinking. 2500 ish with a 150. |
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Posted: 10/25/2016 9:36:18 PM EDT
[#6]
Quote HistoryQuoted:
Is the one fella the guy who applies "precision" to the AR platform and can't be named? A Grendel case, loaded to that pressure seems a little sketchy considering the hoop strength of the system is reduced compared to a thinner case. But it it's good to go, that loaded with a 150 8mm would be about what I'm thinking. 2500 ish with a 150. Quote HistoryQuoted:
Quoted:
Quoted:
Bill Alexander had some incredible results with hot loads out of a 10.5" barrel in 6.5 grendel. Along with the new super strong bolts from that one fella and you could have great (safe) results. Brass is going to take a beating at 60,000 PSI. Is the one fella the guy who applies "precision" to the AR platform and can't be named? A Grendel case, loaded to that pressure seems a little sketchy considering the hoop strength of the system is reduced compared to a thinner case. But it it's good to go, that loaded with a 150 8mm would be about what I'm thinking. 2500 ish with a 150. 300 Olympic super short magnum may be what you're after then. Buy extra barrels though. |
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Posted: 10/26/2016 12:22:50 AM EDT
[#7]
6.8 SPC is already there.
A 6.5 won't be faster out of the same barrel length as the 6.8 SPC. The 30 American has potential to be more efficient, but I haven't been keeping up with it enough to know. |
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Posted: 10/26/2016 1:06:26 AM EDT
[#8]
6.5 Grendel will be faster on target than anything else that will double-stack in the AR15.
Combined with the 129gr Nolser Accubond LR with 1300fps expansion threshold, and you have a very light-recoiling game-slayer. |
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Posted: 10/26/2016 1:39:27 AM EDT
[#9]
I'm not into wildcats, but there seem to be plenty of options like the 6mmBRX that push the envelope of the AR15 platform. I don't know if there have been any sbr velocities posted for such rounds, as they are generally considered "extreme long range" rounds, and like the grendel, are not normally considered for short barrel applications.
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Posted: 10/26/2016 3:44:14 AM EDT
[#10]
Quote HistoryQuoted:
308, 338 fed, 358 winshester .458 SOCOM, of course for 300 yards it will have the trajectory of a mortar. |
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Posted: 10/26/2016 9:25:46 AM EDT
[#11]
Yeah, .458 is a bit droopy. Case capacity does the job pushing a round out the barrel to the power and speeds needed, so the better answer would be the .375 SOCOM. Much flatter trajectory and there are already short barrels in the wild doing it.
The relevant issue is recoil - it kicks like a 20 gauge, and it's one of those things slowing me down as I want it for a pistol, not SBR. Lack of stock makes a big difference at those recoil levels. YMMV. |
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Posted: 10/26/2016 9:44:43 AM EDT
[#12]
Quote HistoryQuoted:
.458 SOCOM, of course for 300 yards it will have the trajectory of a mortar. Quote HistoryQuoted:
Quoted:
308, 338 fed, 358 winshester .458 SOCOM, of course for 300 yards it will have the trajectory of a mortar. I'm a huge fan of 458 socom, but 300 may be pushing it a bit. If you think most of your shots would be <200 then it is a great choice. I've killed many deer and hogs with it and none have run off. I've never experimented with lighter projectiles but I bet the trajectory on some of those would be ok for 300yds. |
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Posted: 10/26/2016 10:54:19 AM EDT
[#13]
Since I was one of the developers of the American 30 I have shot more than a few rounds in evaluation. . I have't run the numbers on the shorter barrels but I'll look at it later today. They have whacked a few big mule deer with it at around 350 or so and one last week at 160 with an 18" gun. The 125 Nolsers and Speers are excellent performers and do well at the speeds the A-30 is doing. The nice thing is the case capacity of the A-30 is higher than the 7.62X39 and velocities are about 150 to 200 FPS faster than a 30-30 with the same bullets with the same length barrel. I know I shot against a short ton of 30-30 TC's back in my IHMSA days and they had plenty of thumb even in the 10" guns.
Greg |
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Posted: 10/26/2016 11:14:53 AM EDT
[#14]
Quote HistoryQuoted:
.458 SOCOM, of course for 300 yards it will have the trajectory of a mortar. Quote HistoryQuoted:
Quoted:
308, 338 fed, 358 winshester .458 SOCOM, of course for 300 yards it will have the trajectory of a mortar. to me that is asking a lot. 300 yards and more zip than the 6.8 out of that short a barrel. Probably something with a similar case capacity but larger bore will be able to burn the powder in a shorter barrel but those gains might be offset by the lower BC of the larger bore bullet. |
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Posted: 10/26/2016 11:27:57 AM EDT
[#15]
Find a LWRC 6-8 upper and lower and be able to load 140gr 6.8 loads long?
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Posted: 10/26/2016 4:02:43 PM EDT
[#16]
Quote HistoryQuoted:
Find a LWRC 6-8 upper and lower and be able to load 140gr 6.8 loads long? That receiver set was never intended for longer COL. The mag well was widened so that a polymer magazine could be made for it and stack the cartridges correctly. |
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Posted: 10/26/2016 5:12:19 PM EDT
[#17]
Orrrrr, bear with me here, get a G2 style receiver set (Mega soon, DPMS, Adams Arms) and have a barrel made up for a 308 based wildcat / 260 / whatever the heck you want.
At that point you give yourself a fairly substantial case capacity to start from. |
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Posted: 10/26/2016 7:00:49 PM EDT
[#18]
Quote HistoryQuoted:
Orrrrr, bear with me here, get a G2 style receiver set (Mega soon, DPMS, Adams Arms) and have a barrel made up for a 308 based wildcat / 260 / whatever the heck you want. At that point you give yourself a fairly substantial case capacity to start from. I had a smiley in my reply but was still serious about the 308 class calibers. Always figured the 358 Winchester could do cool things with the bullets and powders we have now. If I was heavy into reloading I'd try it but until then I leave it to the more dedicated weirdos out there
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Posted: 10/26/2016 7:11:37 PM EDT
[#19]
Quote HistoryQuoted:
308, 338 fed, 358 winshester This. But the trick is getting them to run reliably. Really just custom gas tube length, and right buffer system. In the AR15 platform, 6.8 is hard to beat in the short range. It's the most reliable right now. 6.5G i would say comes in a very close second. But me personally, I'm going to stick with 556 if/when i get into the SBR stuff. More reliable, shot placement trumps all. Easiest to handle, etc etc. You can split hairs with "efficient" in many different ways. |
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Posted: 10/26/2016 9:00:13 PM EDT
[#20]
I went with a 12.5 inch 308 setup. I shoot 168 A-Max. Picked up the complete upper from KAK Industries and replaced the 10.5 inch barrel with a 12.5 inch barrel. Email Kurt over there as he can make about anything you want that fits the bill for you.
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