Wow. Not sure how or why the photos ended up so massive! :O

I slugged the bore as soon as I got it home (pure lead .454 round ball) and the groove measurement is actually .358 Making me wonder why it wasn't rebored to the more common .355-.356 for a 9mm.....

I have a couple of boxes of the Kynoch 245gn 9x57 ammunition, although I'm loathe to shoot it up, as scarce & expensive as it is these days! I also have 20 reloads (with load data) & a bunch of modified 9.3x57 brass to load myself, as soon as my dies arrive.