My Drilling is an early 9,3x72R of the "D" or Deutsch form. RCBS dies for 9,3x72R are for the nomalised case and, like yours, my case so sized was left sticking out and the gun would not close. This is also what happens with any new manufactured case.
A set of dies from Dave at C-H did the job and I can size brass to fit. The D has a curved base for 40mm above the base,(rim). The E (for English)version has a straight taper to 50mm from the base. TYhe normalised is a hybrid form. Simply measure your cerrosafe cast every 5-10mm and you should know what you have. However, don't ask Dave for a D or an E but rather, send him the measurements or the cast or both.
The rim also varies. If it's a D you'll need to reduce it and this is best done from the top, using a spiggot so you're just taking off a small strip, not reducing the whole head. The latter would make the case weaker and also you'd need to recut the primer pocket deeper.
I have here copies of origional factory case drawings of both D and E cases but it's problematic attatching a copy.
