The weight listed in the table above is the minigun's unloaded weight. A loaded steambolt minigun weighs a total of 65 pounds. A steambolt minigun is a heavy, six-barreled weapon that shoots projectiles at an extreme rate of fire. It is belt-fed by an ammo belt magazine with a capacity of 200 cartridges. Reloading: A steambolt minigun uses automatic fire, and only needs reloading when the belt magazine empties. Replacing a belt magazine requires a full-round action. Holding a minigun at the ready gives you a -4 armor check penalty. This armor check penalty increases to -10 while firing.