S. Sumner: You're absolutely right about that M48 ammo, it is made for sub-guns and is also the stuff the CZ-52s were designed to handle.
Correct me if I am wrong but I believe the S&B ammo is made to the original Tokarev specs, which pretty much match the C96 Mauser (Broomhandle) specs. The Broomhandle took an 88 gn bullet at 1400'/sec - the Tok commonly uses (and S&B loads) an 85 gn bullet to 1390'/sec. I recall the ballistics were developed in the Bolo Mauser with a 4" bbl, which would give you a hair more in the 5" bbl, and the Tok barrel is about the same length as the Bolo, so I would think they are literally one and the same.
I know the M48 stuff rocks my Tok, but the S&B shoots very nicely (unless you are standing close to it and not wearing ear protection). The Tok does have a 'bit of a report', doesn't it. Mikey.