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I've loaded the 220 Hornady's with AA1680, everything between 9.4 and 12.8 grains at a COAL of 2.000". According to my notes I've never had a problem with feeding, extraction, or ejection. Only tested at 25 yards with a 4MOA red dot sight so far, 10.4, 11.6, and 12.8 grain loads all put 5 bullets in one hole at that range.
ETA: This is in a 16" M1S upper, carbine length gas, unthreaded muzzle.
Last edited by pomofo; 11-06-2010 at 01:52 PM.
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