Re: RELOADING FOR AN AR--.308 NON Crimp?
.....be apprised that applying a crimp to a non-cannelured projectile (I dislike the word bullet btw), (it's a projectile...) can cause overpressure because it restricts the initial movement of the projectile as it exits the case.
Consequently, applying a crimp is an exercise in experience and caution. Too much equals an overpressure condition and it workhardens the brass prematurely and we all know how hard brass is to get right now. Workhardened necks will crack prematurely and the casing at that point is scrap.
Too little does nothing. I use caliber specific Lee Collet Crimp dies (only Lee dies I use btw), and a deft hand at applying the crimp. I don't care for or employ a roll crimp on any rifle die. All my pistol dies crimp but pistol brass is all straight walled, not bottleneck.
'It's not about me
, it's about we