Jon;
My experience with Lefevers is that the early ones in particular often have oversize bores. My belief is that many of these were built for all brass shells as many were made for waterfowl use & this eliminated the problem of the paper cases swelling. With smokeless powder coming on the scene in the 1890's guns were bored more to true gauge size & the brass cases became less commonly used. Just my thoughts on the subject. May hold true for other brands as well, but I have not checked bore sizes on other brands to the extent I have the Lefever.
