No can't say as I have, but that is the only use I am familiar with for a false muzzle, ie you would only use a false muzzle to muzzle load the bullet. It would never be used with a fully self contained cartridge. I am in full agreement that a drilling in 12x12x38-55 one would think this to have been a hunting gun & would have only been used with "Cartridges". As it is fitted for this false muzzle then obviously it was intended by its owner or planned by its maker to see some use where it would be desirable to muzzle load the bullet. Also I am in full agreement the sights do not look to be target quality, but I could think of no other purpose for muzzle loading the bullet.
