Seat at least one bullet diameter (.224) into the case, fits into the mag, seat to mid cannelure if bullet has one. I rarely if ever read the manual OAL.
Why not? Could be many things, the 223/5.56 AR has a long throat, anything seated to mag length will always have a long jump.
Of all the things that affect accuracy, OAL is way down on my list, especially in a 5.56 AR.
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