hand cannon

noun2

1. •
   An early firearm requiring manual ignition through a touch hole.
2. •
   (US, slang) A very large handgun, often impractically so.

   • Hand Cannon - TV Tropes. Retrieved on 17 June 2022. Magnum-caliber handguns or pistols that use rifle cartridges comprise most of the Hand Cannon trope, due to their superior ballistics.