I have a take off barrel in .380 from a small frame Martini & a bunch of small action Martini's, some of them with the thick side wall frame, I see in old BSA catalogues that they chambered them in 32/40, which is a long sort of cartridge for this action I thought .

Any way I was thinking I could re chamber this .380 barrel (has .375 bore) to 38/55, looks like it might just fit around the corner, any one done this or heard of any one doing it ?