RE: Problem with OAL inconsistency!!!
Some good advise has been offered. Let me add one more thing: Are you compressing the powder when you seat bullets? I've had problems at times with OAL (even measuring with a Stoney Point tool) when the powder was being compressed. Apparently I was getting a little spring back when seating bullets and there was no consistency to how far they were backing out. So, I was getting lots of variation in OAL. More neck tension might have helped, but I don't know.