blunderbuss
A blunderbuss is a firelock muzzle-loading firearm with a short, large caliber barrel, which is flared at the muzzle and frequently throughout the entire bore. this allows the weapon spread all the projectiles to any directions, from its flared muzzle, A blunderbuss can fire round lead pellets and any smaller projectiles of relevant quantity and/or caliber. It's essentially a one-shot muzzle-loaded shotgun, during the 17th century to the 18th century.