There was a Gunmaker named Sheriff Warrel working at Green Row Portsmouth, UK from 1864-1867, His son was listed in census as gunmaker's asst. Sheriff died in 1896 in Plymouth, his son in 1900. Made a lot of shotguns, including 8s. A 4 bore would be a rarity. Need pics. Cartridge gun or muzzleloader?
What we have here is... failure- to communicate.