Looking nice - make sure you slug the bore first.

A lot of M46's have oversize groove diameters. If so, you might not be able to seat a properly sized bullet and still chamber the round.

The chambers usually admit bullets of up to .368" in necked up 8x57 brass, but that's about it - normally. My rifle, while having a lovely bore as well, is .370" groove to groove.

I cannot shoot cast bullets in my old rifle (now my bro's modern moose rifle) unless I open up the chamber to accept .370" to .372" bullets. However, it shoots all jacketed bullets into sub-1" at 100 meters off bags. Not bad for a 1929 rifle.