I have had great success with the following....
40gr bullet, imr 4320, 26.5 gr charge
50gr bullet, imr 4320, 26.0 gr charge
55gr bullet, imr 4320, 25.0 gr charge
All are .224 dia projectiles for .223 ar rifles. With red dot at 50yards, i can shoot out the bullseye with in 20 rounds!!!
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