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.22 Eargesplitten Loudenboomer
Type Rifle cartridge
Place of origin United States
Production history
Designer P.O. Ackley
Designed 1960s
Specifications
Parent case .378 Weatherby Magnum
Case type Flask barrel
Bullet diameter .224" - 5.56mm
Rim diameter Magnum .537"
Ballistic performance
Bullet weight/type Velocity Energy
50 gr (Bad rounding hereScript error g) Machine gun powder 106gr.4,160 ft/s (Bad rounding hereScript error m/s)1,921 ft·lbf (Bad rounding hereScript error J)
50 gr (Bad rounding hereScript error g) H570 100gr.4,170 ft/s (Bad rounding hereScript error m/s)1,930 ft·lbf (Bad rounding hereScript error J)
50 gr (Bad rounding hereScript error g) H570 102gr.4,390 ft/s (Bad rounding hereScript error m/s)2,139 ft·lbf (Bad rounding hereScript error J)
50 gr (Bad rounding hereScript error g) H570 105gr.4,600 ft/s (Bad rounding hereScript error m/s)2,349 ft·lbf (Bad rounding hereScript error J)
Source(s): quoted "Guns and Ammo Magazine", B. Hutton [volume & issue needed]

.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.

See also Edit

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