The basic option. Projectile loads from the front, and reload time is quite slow. If there's any significant friction between the projectile and barrel, a ramrod must be used to push the projectile down the barrel.
- Union loading
A step up. Allows you to load the projectile from the breech, but requires alignment and twisting afterwards. A union can also hold a burst disk. Camlock couplings are similar to unions, but faster to open and close. They are usually rated for less pressure than unions.
Allows you to load a projectile from the breech (end of gun towards user). Mechanism and loading time varies by construction technique.
A tube holds the ammo, about around half a dozen balls. Upon firing, the balls are sucked one-by-one into the airflow, resulting in a tight grouping of balls fired a few dozen milliseconds apart. Suitable for large-caliber weaponry (has been tested with as large as tennis balls) Named after the late Bill Vogt, who came up with the design.