I have an early 20th century H & R single shot smooth bore .410 shotgun marked for 44-40 Shot, 44 Shot and 44XL that I understand were sort of the forerunner to the 410, at least in the U.S. It was always shot with 410 shotgun shells altho it is not so marked. I don't think a 45 Colt would fit in the chamber.

Last edited by cpa; 02/08/19 08:46 PM.