Harman Patil (Editor)

.22 Eargesplitten Loudenboomer

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Type  Rifle cartridge
Designer  P.O. Ackley
Parent case  .378 Weatherby Magnum
Place of origin  United States
Designed  1960s
Case type  Flask barrel

.22 Eargesplitten Loudenboomer is a cartridge for a rifle.

It was invented in the 1960s by P.O. Ackley to set a world record for firing bullets at over 5000 fps (1524 m/s). The round failed to reach the desired velocity, but reached 4600 fps with a 50 grain bullet and 105 grains of H570 powder. It is based on the .378 Weatherby Magnum cartridge case, necked down to .224 calibre.

References

.22 Eargesplitten Loudenboomer Wikipedia