Hello,

I'm in the midst of an inspection period of a circa 1926 Sterlingworth 12 ga. with 28" bbls and when measuring the bores with a bore mic am coming up with .721 and .715 (choke constircition .012 and .033 respectively). All of my other A.H. Fox 12 ga. guns are closer to .729. I'm measuring from the muzzle end to about 12" [from muzzle]. Are these barrels underbored, or was this normal for this time period? Anything to be concerned about?

Thanks,

Jerry