While on the 3 1/4" 10 bore topic.I have two guns that are 3 1/4" chambered and one marked for the brass "Perfect" case. They are not however chamberless. Both guns were black powder proofed and stamped with a bore size of 10/2.This would put it in a range of
.793 - .803. as built. They both measure about .800.They have forcing cones but are not very deep.Obviously designed for the thin wall case and a larger wad. I also have another hammergun by W.P.Jones that started life as a chamberless 12 with 34" steel barrels and was rechambered and proofed to 3 1/2" magnum 10.It did service as such with a friend in Lancashire for several years,accounting for a serious number of Pinkfeet and Greylag before I obtained it.They all weigh over 10 pounds. One is 11 1/4
