I have been having a problem with sizing some 30-06 brass. The brass is commercial Federal, RP and Winchester. the dies are Lee RGB, the lube is Imperial spray lube. The Brass is range pickup and then fired by me several times.
Seems that some of the brass will not chamber without more force than i like. I measured at the neck, shoulder and base and they compare to factory loads (that chamber with ease) I am thinking that the cases are getting work hardened and the shoulder is not getting pushed back enough or is springing back after it has been sized. this does not happen to every case but quite a few.
So in my mind it is either the die is not shaped right (that dose not explain tthe some fit some don't issue). That leaves hard brass that needs to be annealed.
Any of you out there had a problem like this and what did you do to correct it.
Chime in if you have opinions
Michael