| .22 Spitfire | ||
|---|---|---|
| File:5.7mm Johnson Spitfire.jpg .22 Spitfire with FN 5.7×28mm and .30 Carbine cartridges | ||
| Type | Rifle | |
| Place of origin | USA | |
| Production history | ||
| Designer | Melvin M. Johnson | |
| Designed | 1963 | |
| Manufacturer | Johnson Guns Inc. | |
| Specifications | ||
| Bullet diameter | .224 in (Script error: No such module "Math". mm) | |
| Neck diameter | .253 in (Script error: No such module "Math". mm) | |
| Shoulder diameter | .332 in (Script error: No such module "Math". mm) | |
| Base diameter | .353 in (Script error: No such module "Math". mm) | |
| Rim diameter | .356 in (Script error: No such module "Math". mm) | |
| Case length | 1.29 in (Script error: No such module "Math". mm) | |
| Overall length | 1.65 in (Script error: No such module "Math". mm) | |
| Rifling twist | 1:14 | |
| Primer type | Boxer small rifle | |
| Ballistic performance | ||
| Bullet weight/type | Velocity | Energy |
| 40 gr (Script error: No such module "Math". g) | 2,850 ft/s (Script error: No such module "Math". m/s) | 720 ft·lbf (Script error: No such module "Math". J) |
| 40 gr (Script error: No such module "Math". g) | 3,000 ft/s (Script error: No such module "Math". m/s) | 795 ft·lbf (Script error: No such module "Math". J) |
| 50 gr (Script error: No such module "Math". g) | 2,700 ft/s (Script error: No such module "Math". m/s) | 810 ft·lbf (Script error: No such module "Math". J) |
| Source(s): Barnes & Amber | ||
The .22 Spitfire (also known as 5.7mm Johnson or MMJ 5.7mm Johnson[1]) is an American rifle cartridge.
Designed by Melvin M. Johnson of Johnson Guns Inc. for their conversion of the M1 carbine,[2] this wildcat[3] was introduced in 1963. It was based on the .30 carbine, necked-down to .22 (5.7mm).[4]
It is suitable for rabbits, coyotes, or other varmints,[4] and has potential as a military round.[4]
See also[]
References[]
Notes[]
- Barnes, Frank C., ed. by John T. Amber. "MMJ-5.7mm", in Cartridges of the World, pp. 127 & 143. Northfield, IL: DBI Books, 1972. ISBN 0-695-80326-3.
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