.22 Spitfire
.22 Spitfire |
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Type |
Rifle |
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Place of origin |
USA |
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Production history |
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Designer |
Melvin M. Johnson |
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Designed |
1963 |
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Manufacturer |
Johnson Guns Inc. |
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Specifications |
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Parent case |
.30 Carbine |
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Bullet diameter |
.224 in (5.7 mm) |
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Neck diameter |
.253 in (6.4 mm) |
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Shoulder diameter |
.332 in (8.4 mm) |
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Base diameter |
.353 in (9.0 mm) |
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Rim diameter |
.356 in (9.0 mm) |
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Case length |
1.29 in (33 mm) |
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Overall length |
1.65 in (42 mm) |
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Rifling twist |
1:14 |
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Primer type |
Boxer small rifle |
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Ballistic performance |
Bullet weight/type |
Velocity |
Energy |
40 gr (3 g) |
2,850 ft/s (870 m/s) |
720 ft·lbf (980 J) |
40 gr (3 g) |
3,000 ft/s (910 m/s) |
795 ft·lbf (1,078 J) |
50 gr (3 g) |
2,700 ft/s (820 m/s) |
810 ft·lbf (1,100 J) |
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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
Notes
- ↑ "Reloading Quick Reference - Reloading". Cheaperthandirt.com. 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.
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.
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| First generation derivatives | | |
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| Second generation derivatives (based on .30 Carbine) | |
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