SP2,

What you have said is good advice. I'm usually very careful to do just what you have said.

The 9.3x74r has only the slightest shoulder, and headspaces on the rim. But just as you mentioned with the .303 Brit., if you size the brass down too much it will prematurely fatigue. I have seen this with .30-30, another rimmed case. The same goes for belted cases like the .338 Win. Mag. If you set the shoulder back on that one you have trouble, even though it technically headspaces on the belt.

The next time I load the 9.3 I'm going to keep this in mind.

Regards,
CptCurl