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The .22 Spitfire is an American wildcat rifle cartridge developed by Col. Melvin M. Johnson. It was originally named the MMJ 5.7mm by its designer and is also known in the U.S. as the 5.7mm Johnson, the Johnson MMJ 5.7mm Spitfire, and the .22 Johnson, (or 5.7×33mm internationally).
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carbine johnson m1 22 cartridge mmj spitfire rifle originally carbines 7mm caliber 30 bullet melvin hornet conversion bullets appropriate feed
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| .22 Spitfire | Base diameter | .353 in (9.0 mm) | 1.00 | infobox |
| .22 Spitfire | Bullet diameter | .224 in (5.7 mm) | 1.00 | infobox |
| .22 Spitfire | Bullet mass/type | Bullet mass/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 f… | 1.00 | infobox |
| .22 Spitfire | Case length | 1.29 in (33 mm) | 1.00 | infobox |
| .22 Spitfire | Designed | 1963 | 1.00 | infobox |
| .22 Spitfire | Designer | Melvin M. Johnson | 1.00 | infobox |
| .22 Spitfire | Manufacturer | Johnson Guns Inc. | 1.00 | infobox |
| .22 Spitfire | Neck diameter | .253 in (6.4 mm) | 1.00 | infobox |
| .22 Spitfire | Overall length | 1.65 in (42 mm) | 1.00 | infobox |
| .22 Spitfire | Parent case | .30 Carbine | 1.00 | infobox |
| .22 Spitfire | Place of origin | USA | 1.00 | infobox |
| .22 Spitfire | Primer type | Boxer small rifle | 1.00 | infobox |
| .22 Spitfire | Rifling twist | 1:14 | 1.00 | infobox |
| .22 Spitfire | Rim diameter | .356 in (9.0 mm) | 1.00 | infobox |
| .22 Spitfire | Shoulder diameter | .332 in (8.4 mm) | 1.00 | infobox |
| .22 Spitfire | Type | Rifle | 1.00 | infobox |
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