taxidermy2
Member
Why can’t you neck size for an AR if the brass is from that AR?
Could it not be both reasons?
OP...what's the concern about just full length sizing? Extending case life or trying to maximize accuracy?
I've found quality dies produce ammo just as concentric and accurate as neck sizing only dies. Forster and Redding Competition dies are fantastic.
If you're looking to work the brass less, you could always use a body die to bump the shoulder back and then neck size. Or anneal your brass to reduce the work hardening.