Now, just thinking on this a bit more. I also have a W.Richards 20 bore hammer gun with short barrels, but that started life as a double rifle in 450 calibre. I think they will be around the 26 inch mark. Any chance it was previously a rifle that has been re-bored out? My Jackson 20 bore however was built as a shotgun and has original 26 inch barrels; rare in this length, but not unique. Lagopus.....