Larry is right, the LC mark did not begin with chambers less than 3" in length. W W Greener definitely speaks of 2 3/4" shells being in common use for both Pigeon & Wildfowl guns. The common proof for a 2" game gun was for 1 1/8oz, that for the 2 3/4" guns 1 oz. A 2" chambered gun carrying a 1 oz [roof would have been by special request "Only" & would be the much more "UNcommon" proof.


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