.22 Eargesplitten Loudenboomer

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.22 Eargesplitten Loudenboomer
Place of originUnited States
Service history
Used bydr.
Production history
DesignerP.O. Ackley
Parent case.378 Weatherby Magnum
Case typeFlask barrel
Bullet diameter.224" - 5.56mm
Rim diameter.579 in (14.7 mm)
Ballistic performance
Bullet mass/type Velocity Energy
50 gr (3 g) Machine gunpowder 106gr. 4,160 ft/s (1,270 m/s) 1,921 ft⋅lbf (2,605 J)
50 gr (3 g) H570 100gr. 4,170 ft/s (1,270 m/s) 1,930 ft⋅lbf (2,620 J)
50 gr (3 g) H570 102gr. 4,390 ft/s (1,340 m/s) 2,139 ft⋅lbf (2,900 J)
50 gr (3 g) H570 105gr. 4,600 ft/s (1,400 m/s) 2,349 ft⋅lbf (3,185 J)
Source(s): quoted "Guns and Ammo Magazine", B. Hutton[volume & issue needed]

.22 Eargesplitten Loudenboomer is a wildcat rifle cartridge.

This humorously named cartridge was developed in the 1960s by P.O. Ackley for Bob Hutton of Guns & Ammo magazine, and was intended solely to exceed 5,000 ft/s (1,500 m/s) muzzle velocity. Ackley's loads only managed 4,600 ft/s (1,400 m/s)(Mach 4.2), firing a 50-grain (3.2 g) bullet. Based on a .378 Weatherby Magnum case, the case is impractically over-capacity for the bore diameter, and so the cartridge remains a curiosity. The advent of new slower-burning smokeless powders may have changed the equation.[1]

See also[edit]


  1. ^ Ackley, P.O. (1927) [1962]. Handbook for Shooters & Reloaders. vol I (12th Printing ed.). Salt Lake City, Utah: Plaza Publishing. p. 442. ISBN 978-99929-4-881-1. Archived from the original on 2017-07-08. Retrieved 2008-02-13.