Vic,
The reason for the mention of 9.3x74R was your statement that it is 9.3x72R S&S, and 9.3x74R is the case I use for mine.Since now it's not the Sauer, the best case is 9.3x72R.Since 9.3x82R cases are so dear, I wouldn't consider using them. If the fireforming load was on the 82mm case, that might be the reason for hard opening(the case is 10mm longer and would extend into the leade and maybe ahead of it.If the case expands noticeably uneven, you can center it in the chamber for the first firing with a narrow strip of scotch tape.If the rim was the same size as the recess, you could depend on it to center the case.If the H&G bullets you have are sized/lubed, they will be .364", and smaller than you need. Just be patient.
Mike