Sizing question

[FLHunter87]

This is a general question and bumping shoulder back a specific amount. First verifying all brass is the same as far as headspace goes. When you have your die locked and set properly and verify for the first few of the brass. Then you start randomly checking and you start noticing some are bumped back more like .004-.005 more than what you wanted. I know it’s not much, but what would cause that? Using Lapua brass. Would annealing make this more consistent?

I have an RCBS press been reloading for a while on and off and getting back into it more this past year or 2. Just getting a little frustrated. I don’t mind a little difference but that seems a little more than what I would want.

 

[Sadie]

Amount of lube can effect it. Dwell time in the die. I keep pressure on the press handle several seconds. Cases fired various number of times..004 too short is more than I would want.