13.5 & 13.6 are .5315" & .5354" respectfully. 32ga = .526"; 28ga = .550". Appears like it hasn't been bored all the way up to 28ga size, other than the chamber. Crown/R denotes re-proof, not familar with the G in triangle.


Miller/TN
I Didn't Say Everything I Said, Yogi Berra