Have a Colt LE 6940, 16 " bbl with 1:7 twist. Just put a scope on it. Looking for recommendations for best factory ammo to see what it will group. I can get plenty of plinking ammo, American Eagle, Military surplus, etc. Locally, I can get Hornady 75 grain BTHP for 21.00/ box. Federal Gold Medal Match is ...#@! 39.99 box at only local source. I could find the GMM online if anyone recommends it based on experience. I believe they have a 69 gr and a 77 gr. Is a heavier bullet generally (other things being equal) generally more accurate in a 1:7 bbl? BlacK Hills unavailable locally. Nor did I see any at Cabelas on a recent trip. when it was available, and I shot a lot of it in my M1A, I found it close to Fed GMM, but no better. Curious if it is worth hunting it down online for a 5.56 carbine. Military Surplus Lake City shot very well in my 7.62. Curious if anything similar produced for the 5.56. Gun is stock, with a fairly heavy trigger. It shoots anything you feed it, whether .223 or 5.56. Knock on wood, not a single FTF or other problem so far, with maybe 750 rounds down the pipe.