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Posted: 5/5/2015 1:28:48 AM EDT
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Are they finicky about the burn rate of the powder you use? My base of experience for this sized auto loader is the M14 and Garand. Both have reputations for disliking slow burning powders, with some potentially even causing damage to the oprod. I don't know much yet about the 308 AR platform, but I'd like to get one and learn. Some of my best 308 loads are for my bolt gun and use heavies bullets and slow powders (like the 199bthp and 4350). Can an AR safely digest this kind of diet? |
| 4350 is going to make for some awfully high port pressures on an AR system.....keep that to your bolt guns. IMR 4064 is as slow as I go. In fact, with proper load development, 4064 will make about anything sing from 150gr to 175gr pills. If you do pick up a 308AR, just go ahead and pick up either an SLR or Syrac adj. gas block. You can literally tune it to where you want your empties to land. Most 308AR(s) out of the box are overgassed, some worse than others. |
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OK, that's good to know about Varget. I'm not so worried about a shortage, I've got enough to get by for a while. garred8787 -- I looked at several burn charts online and don't see power pro 2000mr listed on any of them. Do you have a link to some references for it? Something progressive-friendly would be a plus (I own half of a Dillon 650) for blasting ammo... |
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IMR-4064
IMR-4895 H4895 Varget RE-15 VihtaVuori N140 and VihtaVuori N150 all work well for me and are great for gas guns. AA-2460 AA-2520 and WW-748 have worked well for me too and are gas gun friendly. Pay attention to .308 cases to insure military brass doesn't get co-mingled with commercial .308 brass. The military brass needs 2.0 full grain reduction of powder charges compared to what works in Winchester, Remington, Federal etc. |
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My 22" 308 AR likes 168 and 175 SMK's with XBR8208 for my "normal" shooting.
with suppressor it REALLY likes 4064 and 175smk. im still working out some subsonic loads with trailboss and 175 smks EDIT: i do have an adj gas block and for now leave it at the setting as if the suppressor is on. alittle over gasses when not attached but nothing crazy |
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I like Reloder 15, great powder.
Quoted:
My 22" 308 AR likes 168 and 175 SMK's with XBR8208 for my "normal" shooting. with suppressor it REALLY likes 4064 and 175smk. im still working out some subsonic loads with trailboss and 175 smks EDIT: i do have an adj gas block and for now leave it at the setting as if the suppressor is on. alittle over gasses when not attached but nothing crazy Wouldn't it be under gassed without the can in the suppressor setting? |
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Quoted:
I like Reloder 15, great powder. Wouldn't it be under gassed without the can in the suppressor setting? Quoted:
I like Reloder 15, great powder. Quoted:
My 22" 308 AR likes 168 and 175 SMK's with XBR8208 for my "normal" shooting. with suppressor it REALLY likes 4064 and 175smk. im still working out some subsonic loads with trailboss and 175 smks EDIT: i do have an adj gas block and for now leave it at the setting as if the suppressor is on. alittle over gasses when not attached but nothing crazy Wouldn't it be under gassed without the can in the suppressor setting? No, but I'm sure it would "hurt" letting more gas througb. Where it's at now I barely get any recoil when shooting unsupressed |
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I've tried IMR3031, 4064 and 4895, and while they shoot decent with the 147gr FMJ, they don't meter well in my progressive. Varget works really well, as does H335 (best metering I've tried, it's a spherical\ball powder). I recently picked up some BLC-2 to try as well. I shoot 147gr and 168gr, occasionally a 175gr with all these powders.
This is out of a 16" DPMS Recon and a 20" Remington 700. |
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OK, thanks for the heads up. If I'm reading the burn rate chart right, Varget is slower than 4064. So Varget is a no go? Looked at 3 different burn rate charts. One puts Varget at the same speed as H4895, one puts it between 4895 and 4064, and one puts is slower than 4064. Varget, Reloader 15, or H4895 or IMR4895 would be my first choices for an accuracy load in a 308 caliber AR-15. |
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Although I like H335 in my bolt gun, MY Ar-10 (S&W M&P10) does not like it. Bolt won't lock back, even at near-max loads. Occasional FTFs, too. This is with 150gr. and 168gr. pills. With 4064, it functions fine. Anyone know if 748 will work in an AR-10 Armalite? (it has the 20 inch barrel). Im using LV brass and some M-80 bullets (147 grn FMJ). Thanks |
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Just came back from the range testing out some loads for AR-Comp pushing 168 AMAX.
Rifle is a Ruger SR 762. 16.125" barrel, chrome lined 1-10" twist. COAL 2.805 Lapua Brass. Rem 9 1/2 Primers Hornady sizer and seating die Light crimp on Redding Taper crimp. 40.4 gn 2515 fps AVG. 1.5" 5 shot 40.8gn 2521 fps avg 1.25" 41.2gn 2545 fps .75" 41.6gn 2585fps BUGHOLE!!! 42.0gn BLOWN PRIMER---OVER PRESSURE!! No pressure signs until 42.0. didn't finish group...obviously... Speeds taken with Magnetospeed. Group sizes approx temp 60F wind 9-3 5mph elevation 1000ASL |
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Quoted:
Just came back from the range testing out some loads for AR-Comp pushing 168 AMAX. Rifle is a Ruger SR 762. 16.125" barrel, chrome lined 1-10" twist. COAL 2.805 Lapua Brass. Rem 9 1/2 Primers Hornady sizer and seating die Light crimp on Redding Taper crimp. 40.4 gn 2515 fps AVG. 1.5" 5 shot 40.8gn 2521 fps avg 1.25" 41.2gn 2545 fps .75" 41.6gn 2585fps BUGHOLE!!! 42.0gn BLOWN PRIMER---OVER PRESSURE!! No pressure signs until 42.0. didn't finish group...obviously... Speeds taken with Magnetospeed. Group sizes approx temp 60F wind 9-3 5mph elevation 1000ASL Could have just been a loose pocket. If you didnt see any pressure signs than that i would have done a few more myself. Where is that compaired to max in a book? |
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Quoted:
Could have just been a loose pocket. If you didnt see any pressure signs than that i would have done a few more myself. Where is that compaired to max in a book? Quoted:
Quoted:
Just came back from the range testing out some loads for AR-Comp pushing 168 AMAX. Rifle is a Ruger SR 762. 16.125" barrel, chrome lined 1-10" twist. COAL 2.805 Lapua Brass. Rem 9 1/2 Primers Hornady sizer and seating die Light crimp on Redding Taper crimp. 40.4 gn 2515 fps AVG. 1.5" 5 shot 40.8gn 2521 fps avg 1.25" 41.2gn 2545 fps .75" 41.6gn 2585fps BUGHOLE!!! 42.0gn BLOWN PRIMER---OVER PRESSURE!! No pressure signs until 42.0. didn't finish group...obviously... Speeds taken with Magnetospeed. Group sizes approx temp 60F wind 9-3 5mph elevation 1000ASL Could have just been a loose pocket. If you didnt see any pressure signs than that i would have done a few more myself. Where is that compaired to max in a book? I doubt it. His velocities from a 16" barrel is what I consider maximum from a 24". |
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