I am converting 30/06 to 9.3 x 63. It is not just simply running it through a 9.3 x 63 die as the neck has to be made larger, then run through the die to adjust the headspace datum line on the case.
So my thought is to make a collet that inserts inside of a 30/06 annealed case that has been run through a 9.3x63 die, expand about 0.20" of the neck (at the shoulder) to 0.20" over the O.D. of the 9.3 case, running it through the 9.3 die again - then fire forming to push the shoulder a head.
Is 0.20" neck expansion enough to form a shoulder to headspace on?
I want to avoid running a 416 Rigby expander button through the case, and sizing the neck down to 9.3 dimensions