I've fired 32. S&W shorts and longs,and .32 H&R Mag as well as the stock 7.62x38 in mine.The only one that worried me was the .32 H&R.I have read that they were about on a par with the original combat loading for the nagant,but I've pulled Nagant ammo and it was .308,while the .32 mag was .312,so it was with some trepidation that I pulled the trigger.I needn't have worried.The soft lead Federal RNFP made it down the barrel with no extra recoil, and the brass was only slightly bulged,and resized just fine.I've reloaded them with a hard cast Linotype/wheel weight semi-truncated Lee .32,sized down to .311,over 3.0 of HP38,and hope to do some more testing this weekend.