I believe if you measure a lot of British guns you will find the vast majority of the So-Called 2" guns will have 2 5/8" chambers or at least 2 9/16" (65mm). Actual 2" chambers will I believe be mostly confined to extremely early breech loaders in 12ga. The smaller gauges may have had true 2" chambers, not sure about them.


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