I had an Otto Geyger best grade double built in late 20's. It was .323 and I made cases from 9.3x74R cases. RCBS has dies for forming,trim and neck ream. I used loads from the Nov/Dec 1985 issue of Handloader. Best load I have marked as 200gr Speer spitzer with 48grs of IMR-4064 for 2377fps. Shot very well with each barrel under an inch and spread between barrels less than an inch. Wish I still had it. It was a beautiful handling gun.