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What twist rate is your barrel?
If you have a 1 in 9" barrel, then I suggest Winchester Q3131A, which is a very clean burning load that has proven to be pretty darn accurate in my AR's.
Its a 1/7 twist, actual Colt barrel; the rilfle I call Frankenstein since I made it out of parts. Its mostly Colt/Bushmaster but the lower is DPMS:ak47:
Where can I pick up the Win ammo? I will probably try the lake city stuff too if bulk is affordable.
You can buy Winchester white box 55 grain FMJ at almost any gun store. Also, the big chains, the likes of Dick's, Sports Academy, etc., should carry it.
In your case, though, you have a very fast twist, with that 1 in 7" barrel. A 55 grain FMJ might not be optimal for such a barrel, although it would certainly work well.
62 grain ammo would probably be the better choice, in which case you can find at any number of dealers. Ammoman is one such place:
http://ammoman.com/webstore_223.htm
Also, Natchez has Sellier and Bellot (excellent Czechoslavakian ammo):
http://www.natchezss.com/Ammo.cfm?c...ier and Bellot 223 Rem 62 gr Green Tip 20/box
and Fiocchi:
http://www.natchezss.com/Ammo.cfm?c...&prodTitle=Fiocchi 223 Rem 62 gr FMJBT 50/box