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Post by wilson1968 on Jan 28, 2015 18:30:31 GMT -8
I did my first ar10 build. Decided on the 260. I have sized down some lc 308 brass and was wondering about brass prep and if any one else has used 308 necked down and what their experience was.
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Post by sleepy28 on Jan 29, 2015 5:00:53 GMT -8
I have never tried the .308 brass but I found some 7mm-08 once fired brass and it works great . I just run it through my FL die and trim OAL good to go . I have a 24 in 260 BHW barrel on a DPMS upper 1-9 twist.
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Post by GLSHOOTER on Jan 29, 2015 5:49:22 GMT -8
The 308 should work without neck turning. You should check the tickness by comparinga FIRED 260 case to a loaded converted 308 to make sure they are not too thick. It should have at least 0.002 room for expansion.
Greg
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Post by wilson1968 on Jan 29, 2015 18:25:05 GMT -8
I don't actually have any 260 brass and this will be my first loading. I'll load one up and measure and go from there. I've have read other forums of some people having to turn necks. I was just seeing if any one else had a similar experience. I have about 500 rounds once fired 308 and no 308 to shoot so I figured I would just try necking down and shooting them for a nice cost saving on brass.
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Post by GLSHOOTER on Jan 30, 2015 20:47:16 GMT -8
I don't actually have any 260 brass and this will be my first loading. I'll load one up and measure and go from there. I've have read other forums of some people having to turn necks. I was just seeing if any one else had a similar experience. I have about 500 rounds once fired 308 and no 308 to shoot so I figured I would just try necking down and shooting them for a nice cost saving on brass. Let us know how it goes. Many guys neck up the 243. I'd almost bet you won't have to neck turn. Greg
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Post by wilson1968 on Aug 17, 2015 14:23:58 GMT -8
well its about finally time. after several months of sitting in storage i finally pieced together my 260 ar 10. just loaded up a few rounds to try out. i necked down 308 lc with great results. a lil imperial wax and a single smooth stroke of the press. when loaded the necks showed they did not require and turning. the only component im missing right now is a gas block which i just ordered. i loaded these rounds up with h3450 45gr @2.8 topped with a 123 amax. so hopefully this weekend ill get to finally shoot this bhw barrel.
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Post by devildogandboy on Aug 17, 2015 16:51:35 GMT -8
well its about finally time. after several months of sitting in storage i finally pieced together my 260 ar 10. just loaded up a few rounds to try out. i necked down 308 lc with great results. a lil imperial wax and a single smooth stroke of the press. when loaded the necks showed they did not require and turning. the only component im missing right now is a gas block which i just ordered. i loaded these rounds up with h3450 45gr @2.8 topped with a 123 amax. so hopefully this weekend ill get to finally shoot this bhw barrel. if you ordered your gas block from BTE you should have it in no time, i got mine the following day(but i'm local)! good luck with the build and post the results. Bruce
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Post by mosigdude on Aug 17, 2015 17:03:05 GMT -8
I'm late to the party on this but I have made several thousand 260 brass from once-fired 308 Remington Match. I did mine in 3 steps, first and second steps were FL sized in 308 win and 7mm-08 dies sucessively, both of these dies are held off the shellholder approximately 0.050" so I'm hitting the neck as much as anything, the final sizing is with a FL 260rem die set to bump the shoulder .003" less than my fired case dimension. This may be overkill but I don't see a difference in POI or velocity in my loads from first-firing and successive firings.
There are other ways to accomplish this same result but I already had all these dies on hand so this was my way.
Mine also do not require neck turning but I do kiss them just enough to even up the thickness all the way around the neck.
My final loads turn in less than 1/2 moa @ 200yds out of a pretty basic bolt gun with a standard non-match chamber. I don't own a 260 in an AR platform yet but it will be the next and it will be BHW!
Can't wait to hear how yours runs!
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Post by wilson1968 on Aug 23, 2015 17:11:01 GMT -8
well took it out today and ran into a few problems. first i was having trouble with it loading from the mag. it would pick up a new round but be shy of fully loading into chamber. pissibly caused by the necked down 308 brass on its first firing. second problem was a broken bolt catch after a few rounds of fireing.. im not sure if it was defective as its brand new and only got 7 rounds down the tube. as far as the feeding goes. i measured the necks they were pretty consistent at .2965 for the most part. i might have hit them with the neck turn to even every thing up Attachments:
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Post by GLSHOOTER on Aug 23, 2015 18:28:10 GMT -8
Check with David Tubbs. A weak link in the AR10 has been the bolt catch early on.
Greg
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Post by wilson1968 on Aug 24, 2015 2:53:43 GMT -8
i emailed mega arms. i wasn't for sure if it a special design since it was on one of their ambi lowers. i really only got to shoot 7 rounds through it before it broke.
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Post by GLSHOOTER on Aug 24, 2015 7:46:57 GMT -8
i emailed mega arms. i wasn't for sure if it a special design since it was on one of their ambi lowers. i really only got to shoot 7 rounds through it before it broke. I would say it was a bad one. I'm sure that they will fix your up. Greg
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Post by wilson1968 on Aug 24, 2015 16:14:41 GMT -8
they said they had problems with them being brittle and made the switch to a different company's and has fixed that problem. they do have one in the mail for me though.
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Post by GLSHOOTER on Aug 24, 2015 17:29:11 GMT -8
they said they had problems with them being brittle and made the switch to a different company's and has fixed that problem. they do have one in the mail for me though. Brittle is good in peanuts, not steel. Greg
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Post by wilson1968 on Aug 24, 2015 17:50:31 GMT -8
i mentioned earlier that there was a second problem. loading from the mag. it just is not closing fully and locking in. im thinking maybe a heavier buffer spring. i have a jp silent capture on it right now. i bought it used with my bcg as a package. could it be maybe the springs are to weak to fluyy feed a round. i even reloaded the fired cases i made from lc 308 brass because on initial sizing the shoulder was a little wavy and i thought it might be catching there. but that is not the case. i even necked up a piece of 243 brass and its neck measured .292 loaded. any suggestion would be nice.
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