The closest "common" cartridge would seem to be the 450 Peabody Martini with a case length of 2.33" I don't have them to pace side by side but the neck and shoulder seem to match with the loss of length occurring on the main body of the case. the Peabody also has a slightly thicker rim which would account for a small part of the difference. I'm a little surprised the gun doesn't have the case length engraved on it somewhere.

Last edited by NTaxiarchis; 02/06/20 03:28 PM.