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9/22/2017 12:11:25 AM
Posted: 5/22/2003 6:08:03 PM EDT
This is my first AR15 and I'm looking for ammo.

What is the best grain size and why for a 16 inch, 6 groove, 1x9 twist barrel? The common sizes seem to be 62grn and 55grn.

Link Posted: 5/22/2003 9:21:21 PM EDT
Read the Ammo FAQ above. The consensus seems to be M193 55 grain FMJ ammo is the best general purpose round. I personally like both M193 and the M855 and/or SS109 ammo.
Link Posted: 5/24/2003 5:06:29 AM EDT
I agree that the mil-spec 55-gr ammo is the best all around stuff, especially for a 14.5-to-16 inch barrel AR15. I would rate Win Q3131A, Lake City XM193 and the South African M1A3 surplus as my personal favorites. The 55-gr gets maximum velocity and frag potential in the short barrels, still netting 2700fps+ past 100-yards to ensure fragmentation of the bullet and max wound potential. The heavier 62-gr bullets will quickly fall to less than 2700 fps after leaving the barrel and will perform a thru-and-thru in one piece, not dumping their full energy into the target. Read this site's excellent ammo FAQ to get more info. Tight Groups, phoenix 27
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