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9/22/2017 12:11:25 AM
Posted: 8/29/2002 2:05:39 PM EDT
Hi everyone, I own a bushmaster m4, postban, 1:9 twist. I am thinking about buying some ammo from ammoman.com and he has a sale on 63gr fmj. I normally shoot 55gr. Will my weapon be ok with the 63 gr? thanks
Link Posted: 8/29/2002 2:11:30 PM EDT
Yes but you may want to double-check the zero on the rifle with the new stuff.
Link Posted: 8/30/2002 7:53:05 AM EDT
He also has a sale on 55gr FMJ (XM193) until Sept 2.
Link Posted: 8/30/2002 8:35:52 AM EDT
Link Posted: 8/31/2002 7:35:11 AM EDT

40gr, Really? That low?

How about burning out the barrel throat faster?
Link Posted: 8/31/2002 10:27:41 AM EDT
Link Posted: 8/31/2002 10:30:00 AM EDT

The sweet-spot for accuracy with a 1:9 twist barrel is 62 grn.

63 grn be....fine !!!
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