Resized case length vs fired length

[LR1955]

Thanks noone for your reply. If you full length resized your Grendel, what would the setback be? Would it be as much as .020"? JD

JD:

Factory brass is normally a bit smaller so it will fit into a wide variety of headspaces. So, I wouldn't really worry too much if your fired brass, once sized, isn't as small as the factory brass.

Easy way to check. See if your fired and then sized cases chamber and extract easily. If they do, you have bumped them enough. Most likely your sizing die was made well enough that when the case is inserted for sizing, you can't push it into the die anymore unless you cam-over or machine off some of the shell holder.

Maybe the headspace is a bit on the loose side? And if so, does it really matter?

LR55