Shoulder bump variance

[KJW]

Hey everyone, curious how tight you hold your shoulder bump variance. I'm sizing lapua brass in a rcbs match master bushing die. For the most part it stays consistent. But I do see a few that will be .002 difference. Seems like a lot to me. Measuring with hornady head space and Lyman caliper. Is this to much or am I over thinking things thanks

 

[Rhovee]

If you are putting different amounts of lube on the case there will be a difference. If your brass has been fired different amount of times it will be different. I have found the most consistent i achieve, is when i anneal brass every firing, and keep the firings the same on each piece. Imperial size wax and a consistent force and stroke on the press works good. I see about .0005 either side of .002 desired set back on shoulder.

 

[jimbires]

I agree with everything that Rhovee mentioned , and also by using the competition shellholder sets from redding keeps my shoulder measurement just about spot on .

 

[L.Sherm]

I hold the press handle down for a few seconds and that seems to help.
Also what Rhovee said.

 

[KJW]

Great stuff guys, it all makes sense and gives me some things to try. Thanks