Does the FN have a 2 3/4” chamber? If it is 2 1/2” I for sure wouldn’t bother with the notion of putting choke tubes in that one. The proof marks on the FN barrel will be 65 for the short chamber, and 70 for the 2 3/4” version.
Actually, I wouldn’t bother with tubes in either gun. Just open the chokes and use them for steel when you have to. Choke tubes are kind of a nuisance, my guns that have them always seem to end up with an IC or MOD, and get left that way.
Some of the Brownings had pretty thin steel in the barrel, out in the choke end. Bulged barrels in Browning A5s was a thing before steel shot came along. A choke job, with multiple tubes might be worth more than either gun, at this point.
Best,
Ted
