Small grenade rifles were used, to be able to shoot an explosive device over a long distance.
A cup constructed as a small mortar was attached to the base of a flintlock rifle.
With a heavy powder load, a small hand grenade could be thrown up to 250 meters.
The grenade's fire tube was fired either when the propellant exploded or had to be ignited by hand before the shot.
Both was quite unsafe and dangerous for the shooter.
The caliber is 72 mm.
Grenade rifle, German, around 1720 to 1730,
Iron, bronze, wood, length 67 cm
Bavarian Army Museum, inv.no. A 1833