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I have loaded several hundred of thier bullets in 55 grain, in my AR-15's with a 16 inch barrel. I tried all the usual powders most mfg's recommend for that round and found that H322 worked the best. That said, my two AR's just preferred H322 not that the others are better or worse. I was getting 1/2" groups at 125 meters using 21.5 grains, Winchester brass and Winchester SR primers. After I went with the Nosler standard bullet in 55 grain Ballistic Tip, my groups went down to 1/4" at 125 meters. Same powder, cartridge and primer. Since I do not have a Chronograph I cannot give you any other information, expect that my two AR's much prefer that powder and bullet combination. Good Luck!
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