I recently purchased a sinclair run out gauge, and found out that all of the rounds i am loading are very crooked. I thought that the problem may have been my seating die, so i got a forester bench rest seating die. This didn't help. I am using a brand new rockchucker press, and its operation seems to be good.
When i measure my fired brass, there is usually <.001 run out on the neck. After running the brass trough my sizing die, run out increases to ~.002 or .003. Then run out increases to .004 to .008 on the seated bullet when measured close to the neck.
I am not sure how to fix this, but i am thinking that a better sizing die would help? What would you guys do?