I have a Wm. Ford 20ga. hammer. Built on the "Heath chamberless system". Barrels have 20ga. chambers, 16ga. bore and 18ga. chokes. It is so stamped on the underside of the barrels. No forcing cones, extremely mild recoil and F/F chokes. It ain't a 10 but the principle is the same. These Brits figured this out over 130yrs. ago and if I ever have a gun sleeved again this is what I will have done.
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