Where is .375 Ruger brass presently available. I have about finished the metal work on a Mauser in that caliber but opened up to .416 cal.

A 375 Ruger loaded round will just fit in the Mauser magazine but the magazine will easily open up in the rear to fit lengthwise anyway.

But I need some 375 brass that I can expand the neck and load to 416/375 to continue working on it.

I think perhaps a 338 box (ref. Jim Wisner) will work for this round with a little rail work perhaps but I'm in unchartered waters for a little while and some brass would sure help me out..