.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 | ||||||||||||||||
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[]
References[]
- ↑ "Reloading Quick Reference - Reloading". Cheaperthandirt.com. http://www.cheaperthandirt.com/MediaPages/ArticleDetail.aspx?mediaid=433. Retrieved 2012-05-22.
- ↑ Barnes, Frank C., ed. by John T. Amber. Cartridges of the World (Northfield, IL: DBI Books, 1972), p.127.
- ↑ Barnes and Amber, p.127.
- ↑ 4.0 4.1 4.2 Barnes and Amber, p.127.
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.
The original article can be found at .22 Spitfire and the edit history here.