Got around to scoping/slugging the bore on the .300 Rook. Being a Martini action I used the Hawkeye from the muzzle. I first noted very deep lands & grooves. That was the good news. The occasional pits, and the loose spot in front of the chamber were the bad news frown

A 00 buckshot ball used as the slug:

[Linked Image]

Near as I can tell the groove dia is .297" or so.

I can't reach the chamber with the Hawkeye, so I need to find one of those flexible borescope thingys that works with an iPhone and see why the bore is loose in front of the chamber. I don't see any bulges in the barrel exterior, but something is amiss.

I really wanted to shoot it in the original chambering, but the bore wear certainly creates an opportunity to rebore it to something like a .32-20 or .38 Special

"...the designer of the .270 Ingwe cartridge!..."