What type of shotgun has a flintlock hammer and uses a shotgun shell?

Answer 1

None. Flintlock systems required for powder to be poured into a tray. Once that powder was ignited, the fire would travel to the main charge, which would ignite and launch the projectiles forward.

Shotgun shells (and modern munitions) do not require this method to ignite, because the primer (which ignites the gunpowder) is an integral part of the cartridge.

There are several hammered shotguns which had been manufactured throughout the years, and the list would be extensive. New Haven Firearms made such shotguns in the 1800s. For further information on shotguns of this type, you should seek out persons who compete in Cowboy Action Shooting Sports, as a hammered shotgun is one of their required weapons, and they tend to be very knowledgeable on these.

As for the flintlock equivalent to a shotgun, there were a couple different approaches. One was the blunderbuss (see related link 'Wikipedia - Blunderbuss'. Another means of achieving this effect was accomplished by taking a smoothbore musket ball, and lightly gluing smaller buckshot to it, which would separate and spread when the musket was fired. This was called "buck and ball", and proved particularly lethal during the American Civil War.