Check carefully on the bottom of the barrels further toward the muzzle. There should be more proof marks. Should be some numbers that will show chamber/choke.
2.5 inch shells are relatively easy to come by, several companies make them. (well in normal times anyway)
Your choice as to whether you want to lengthen the chambers. For a bird gun, there is no significant difference in performance.
2.5 inch shells are relatively easy to come by, several companies make them. (well in normal times anyway)
Your choice as to whether you want to lengthen the chambers. For a bird gun, there is no significant difference in performance.