Miller is right on all counts (as usual). When I have more time Ill try to help if you still need it.
Chuck, the 9.3x74R will swell or rupture when fired in the larger 9.3 chamber. The head is 12.1 mm vs 11.8 for the 74R, and wont allow fire-formed cases to expand, so they may rupture-especially cheaper brass. Not sure, what lathe work is required on the rim? (I couldnt read your book). Jerry, make a drawing of all dimensions of the chamber cast and report on them. It might make more sense that way.
Please do slug the bore and give us the result so you can move forward. . Be careful with this, like the 74R, the 9.3 Sauer is a .375 H&H class round.
Best,
C.
Last edited by C. Kofoed; 09/06/11 09:21 PM.
