The 475 Linebaugh is the creation of John Linebaugh of Maryville, MO. It is the current favorite in the contest to develop the world's most powerful revolver cartridge, a role that it fills rather well. The cartridge is based on the 45-70 Government case cut off at 1.5 inches and loaded with .475 inch diameter bullets weighing from 320 grains to 440 grains. The 475 Linebaugh, like all other super-magnum handgun cartridges, is intended primarily for hunting big game or as a backup when confronting dangerous animals. A 370 grain bullet starting out at 1495 fps develops 1840 fpe, and a 440 grain bullet at 1360 fps develops 1800 fpe. This is 108 foot pounds greater energy than the top 454 Casull loading, so we can accept the claim that the 475 Linebaugh is the world's most powerful revolver cartridge. However, there are other factors that would probably make it even more effective, because the top energy load for the 454 Casull is a 260 grain bullet at 2323 fps muzzle velocity. 

This text is based on information from “Cartridges of the World”, Hodgdon reloading manual, the cartridge designer and/or own resources.

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