I do a plunk test on every brand/type bullet on every gun I own and keep a log of the plunk OAL. When reloading I set the OAL 0.015 shorter than the original OAL and recheck the plunk test this time I check to make sure the bullet spins in the chamber and does not hang up. Sometimes I may have to go to 0.020 to get it to spin. Once the bullet spins and doesn't hang up that becomes my permanent OAL for that brand/type of bullet.