T S T V Mauser?

[Patrick Chadwick]

8.15x46R The correct (CIP) designation is 8.15x46R (Nominal) bullet diameter 8.15 mm (Nominal) case length 46 mm R = Rand (German for rimmed) But the following designations have been used in the past 8.15x46.5 R Jagdgewehr Normal 8.15 Frohn 8.15x46 R Frohn 8.15 Harstang 8.15x46 R Normal it's all the same!

That should read (Nominal) BORE = 8.15 mm
NOT BULLET

However, these size designations are always a bit odd. If you really want to know what the actual groove diameter is, I suggest you slug it.

All the reloading info I can find here points to 0.321" lead bullets (grease-groove or copper-plated) as the right kind of projectile. So 32-40 bullets will be fine.

But NOT hard-jacketed bullets - they are too hard to deform enough to fill the grooves - the 8,15x46R was concieved at the end of the black-powder era, and the groove depth is a hefty 8 thou, if the CIP data is to be believed. Another reason to slug the bore and measure what it actually is!