| .22 Eargesplitten Loudenboomer | ||
|---|---|---|
| Type | Rifle cartridge | |
| Place of origin | ||
| 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 (3.2 g) Machine gun powder 106gr. | 4,600 ft/s (1,400 m/s) | 1,921 ft·lbf (2,605 J) |
| 50 gr (3.2 g) H570 105gr. | 4,170 ft/s (1,270 m/s) | 1,930 ft·lbf (2,620 J) |
| 50 gr (3.2 g) H570 102gr. | 4,390 ft/s (1,340 m/s) | 2,139 ft·lbf (2,900 J) |
| 50 gr (3.2 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 | ||
.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.