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155 gr. bullets out of a 1/11.25 twist barrel

Re: 155 gr. bullets out of a 1/11.25 twist barrel

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I too have a 18" GAP10 308 and I just loaded 100 rounds of 155's with h4895 powder. I'll let you know how they work, someday.
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Re: 155 gr. bullets out of a 1/11.25 twist barrel

Never could get 155's to work in my 11.25 barrel (24" 5-R Milspec). It does real well with the 175's and now I'm using the 178 A-Max with great results at 300 yards+
 
Re: 155 gr. bullets out of a 1/11.25 twist barrel

Your unexplained flyers are probably not bullet related, but a combination of powder charge, concentricity, neck thickness, and neck tension(hardness of the brass). My Rock 308 barrel shot 155Scenars extremely well, I pushed them hard, 3050fps, but I got sick of my brass only lasting 5 reloads, so if I want 260 performance I shoot my 260, my 308 is 175/178 only weapon now.
 
Re: 155 gr. bullets out of a 1/11.25 twist barrel

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: CNC</div><div class="ubbcode-body">That's what my GAP-10 is. 155 gr Lapua Scenars work like a charm in it. </div></div> What velocity are you running them.
 
Re: 155 gr. bullets out of a 1/11.25 twist barrel

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 427Cobra</div><div class="ubbcode-body">Your unexplained flyers are probably not bullet related, but a combination of powder charge, concentricity, neck thickness, and neck tension(hardness of the brass). My Rock 308 barrel shot 155Scenars extremely well, I pushed them hard, 3050fps, but I got sick of my brass only lasting 5 reloads, so if I want 260 performance I shoot my 260, my 308 is 175/178 only weapon now. </div></div>You may have something there. I'm using 46.0 grs. of RE-15 with the 175's getting 2850 fps. I noticed this morning when going through the brass a few had splits at the shoulder neck junction. Yesterday shooting a 1000 yard fclass match I had three sighters you could cover with a 1 1/2 inch spotter then 1st shot for record goes in the 8 ring at 1 oclock, I didn,t think to check the brass, my bad.
 
Re: 155 gr. bullets out of a 1/11.25 twist barrel

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ARShuter</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: CNC</div><div class="ubbcode-body">That's what my GAP-10 is. 155 gr Lapua Scenars work like a charm in it. </div></div> What velocity are you running them.</div></div>

The barrel is 18.5", 1:11.25 twist. I've just ram the Southwest Ammo load. They claim 2900 fps for a 24" barrel; I've never chronoed this. I can give you my dope out to 700 yards if you want to try and back calculate it.
 
Re: 155 gr. bullets out of a 1/11.25 twist barrel

155 scenars with somewhere around 44.5 grains or so of RL15 or Varget should be a good load. They could probably go a little hotter but thats getting close to max load. They molly tipped bullets can have feeding problems in a semi auto. The 175's will do better in a 1/10.
 
Re: 155 gr. bullets out of a 1/11.25 twist barrel

Yeah I had a shilen 1/10 twist that really shot it had close 3500 rounds through it when it crapped out. Really wish I'da stayed with the 1/10. I couldn't get this barrel to shoot til I got the velocities way up.
 
Re: 155 gr. bullets out of a 1/11.25 twist barrel

I had some left over R15, and loaded up some 155smk's 2156. I will say the load test was useless. All the groups looked almost identical, around 1/2-3/4 moa. This was out of my FCP with a 1:10 24" stock barrel, so I am sure they will shoot if you find the right powder combo.
 
Re: 155 gr. bullets out of a 1/11.25 twist barrel

Fwi, I shoot 175's smks mostly out of a gap crusader. Bought 2 boxes off 155 scenars and holy sh#%! had a 1.3 inch group at 530 yards. But I will also say that during the big 208 amax compatible in .308 drama here on the hide I decided to test for myself. My barrel is 1:11.25 bartlein. With 42.0 grains varget lapua brass, rlr 9 1/2 primers, at 2.825" coal... The 208 won hands down. 2470 at the muzzle and would stay super sonic to 1400 yards. My first test at 400 yards with a 5 shot group was 3/4". At 520 it was 1". No wind calls. Just got to pick your poison
 
Re: 155 gr. bullets out of a 1/11.25 twist barrel

I shoot the 2155 155gr SMK with 47gr of Varget Moly coated for Mid Range out of my 1:11.25. They shoot just fine. Actually I know several guys who shoot 1:10's for Palma and the 155's work just fine.