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Posted: 10/26/2004 5:24:29 PM EST
I bought a CMMG upper I plan to build into a rifle. What is the best grain bullet to use for 100-400 yard plinking. I've heard too light of a bullet will tear appart with the fast twist rate. Are the heavier grains readily available and fairly inexpensive? Help a n00b out! Thanks.
Link Posted: 10/26/2004 5:28:04 PM EST
55gr and heavier, although some have used ligther without issue.
Link Posted: 10/26/2004 5:29:05 PM EST
Just don't go shooting feather-weights through that barrel, unless you want that mini-shotgun effect.

(Or the "damn, my bullet got jammed in the barrel" effect).
Link Posted: 10/26/2004 5:32:44 PM EST
55 gr M193 are fine with me.
Link Posted: 10/26/2004 5:38:56 PM EST
My 1:7 loves my loads of 69 SMKs. You really won't have a problem with anything above 55 grains.
Link Posted: 10/26/2004 5:43:11 PM EST

Originally Posted By M4Kid:
Just don't go shooting feather-weights through that barrel, unless you want that mini-shotgun effect.

(Or the "damn, my bullet got jammed in the barrel" effect).


I don't think you should any problems shooting normal 223Rem/556NATO. I think the only you will run into exploding bullets, is in those ultra-velocity rounds such as the 22-250 with the muzzle velocity of 5,000fps.
Link Posted: 10/26/2004 5:51:43 PM EST
[Last Edit: 10/26/2004 5:53:36 PM EST by CJan_NH]
I've handloaded and fired 40gr Nosler Ballistic Tips out of my 1/7ROT Colts with no problems whatsoever-aside from accuracy being less than spectacular (no explosions, no bullets flying apart, and no pieces stuck in the barrel).

That being said 55gr (and heavier) bullet weights are ideal.
Link Posted: 10/26/2004 6:00:12 PM EST
55 grain Winchester Q3131A, and 55 grain Federal XM193 are both considered to be high quality, but decently priced ammunition. Most of us have both on hand.
Link Posted: 10/26/2004 6:24:02 PM EST
will take any weight .223 or 5.56 from 55 to 80 grain.
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