505 Gibbs, housed in a Magnum Mauser action, with its 525-grain bullet exiting the muzzle at 2,300 fps and delivering 6,100 ft/lbs of energy quickly gained a reputation as an excellent get-out-of-jail card for the professional hunter.

505 Mag. Gibbs. This cartridge was developed by George Gibbs of Bristol in 1911 and originally intended for use in double rifles, but somewhere along the road he changed his mind and turned it into a rimless round for use in magazine rifles, for which there was a flourishing market.

The giant nitro express rounds were invented for a very specific type of hunting. They are intended for dangerous game like lions or tigers, and the idea is to have a round powerful enough to stop a charging animal with one shot, because there will be no time for a second one.

17 Hornet is the smallest caliber round in production. But it is a very powerful, very high velocity round used for killing varmints. .22 short gives it a run for it's money for 'smallest' production round, but even weak as it is, . 22 short is more powerful than almost all airguns.