Well last summer I bought 2000 of these at Cabella's for $20 / brick. I loaded 50 rounds of 223 yesterday morning and substituted these for the Remington 7 1/2's i usually use. My load is 25.5 grains of TAC behind a 65 grain Sierra game king. Took them to the range and they seem to shoot very well and seem to be fine in my AR.i haven't tested them thoroughly but they seem fine on this first trial .