Thomas Bland, 8 bore. made form a Harpoon gun. 15 lbs 9 oz. 28" barrel.
Had it done in the UK, thats a story in itself. more to follow

Also shown is a breech shot with a 458 in the chamber for scale.
another is a 32 S&W rook rifle for comparison.
The rifle is in otherwise original condition as you see it.