.22 Spitfire
| .22 Spitfire | ||||||||||||||||
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| Type | Rifle | |||||||||||||||
| Place of origin | USA | |||||||||||||||
| Production history | ||||||||||||||||
| Designer | Melvin M. Johnson | |||||||||||||||
| Designed | 1963 | |||||||||||||||
| Manufacturer | Johnson Guns Inc. | |||||||||||||||
| Specifications | ||||||||||||||||
| Parent case | .30 Carbine | |||||||||||||||
| Bullet diameter | .224 in (5.7 mm) | |||||||||||||||
| Neck diameter | .253 in (6.4 mm) | |||||||||||||||
| Shoulder diameter | .332 in (8.4 mm) | |||||||||||||||
| Base diameter | .353 in (9.0 mm) | |||||||||||||||
| Rim diameter | .356 in (9.0 mm) | |||||||||||||||
| Case length | 1.29 in (33 mm) | |||||||||||||||
| Overall length | 1.65 in (42 mm) | |||||||||||||||
| Rifling twist | 1:14 | |||||||||||||||
| Primer type | Boxer small rifle | |||||||||||||||
| Ballistic performance | ||||||||||||||||
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| 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
- List of cartridges by caliber
- List of rifle cartridges
- 5 mm caliber
- .22 TCM, a similar necked .22 centerfire round
Notes
References
- 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.
Cartridges derived from the .32 Winchester Self-Loading or its derivatives | ||
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| First generation derivatives |  | |
| Second generation derivatives (based on .30 Carbine) |
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