John, Mine is a circa 1934 and although I've not shot it in some time it's a standard .257 Roberts. If I remember correctly it has a tight chamber. I had to inside neck ream my cases. It's a boring rifle, put the crosswire on a target, pull trigger bullet goes where the crosswire was. If I lived somewhere where there were varmints I would get more use out of it. One of my first Niedner-Shelhamer rifles.

MP Sadly Deceased as of 2/17/2014