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Posted: 2/7/2006 12:17:39 PM EDT
I am building an AR15 for target practice, colt heavy barrel upper 1/7 twist 20",on top of a bushmaster lower with 2 stage trigger.

what do I need to know about heavy grain bullets in the 69-77 grain range?

will they feed reliably from a 10 round magazine?

are molly coat bullets any better than copper?

I am only interested in heavy bullets, as I have a 16" bushmaster for my 55gr work.
Link Posted: 2/7/2006 12:56:21 PM EDT
Yes they will feed reliably from ANY reliable AR-15 magazine.
Link Posted: 2/7/2006 10:08:26 PM EDT
great,how about bullet design and material?
Link Posted: 2/7/2006 10:33:11 PM EDT
If you are not shooting moly already, just go with plain "nekkid" bullets already.

Are you looking for reloading info, or are you just wondering in general if 69-77 grain bullets will "work" in your gun?

if so, yes, your 1/7 twist should stabilize up to 80 grain bullets. you will have to test them all to see which one works best, although the 69 grain is a very good all around bullet that should have good accuracy and ease of use/ loading

Link Posted: 2/7/2006 10:36:12 PM EDT
bullet design and material- just go buy some sierra, nosler or hornady bullets. doesn't matter what they are made out of, they are well made and they work. get some 69 grain ammo and shoot it until you get bored of small groups or you want to shoot past 400yards. then you could switch to the 77 or 80 gr bullets for the increased coef. numbers.

Link Posted: 2/9/2006 4:36:30 PM EDT
so molly bullets have no special advantage?
Link Posted: 2/9/2006 4:53:36 PM EDT
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