Reminds me of the old British double rifles. You know the ones which have the caliber measured in "bore". Some of those have to have been close to .90 cal. I have seen a pic of a 4 bore round and it was MASSIVE (dwarfing a .50 BMG). I have heard of 2 bore muzzleloading double rifles.
BTW Anzio's Iron Works makes a bolt action that shoots a 20mm Vulcan cannon round (what an F16, F15, and F22 shoot). That = .80 cal.
WOW that thing is heavy 25 pounds, definitely not for those looking for a lite weight gun. Even at that weight I would not want to be the one testing out the recoil on it, but it would be fun to watch.
WOW that thing is heavy 25 pounds, definitely not for those looking for a lite weight gun. Even at that weight I would not want to be the one testing out the recoil on it, but it would be fun to watch.