This article is about the rifle cartridge. For the short story ".220 Swift", see
Karl Edward Wagner.
| .220 Swift |
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| Type | Rifle |
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| Place of origin | United States |
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|
| Designer | Winchester |
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| Designed | 1935 |
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| Manufacturer | Winchester |
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| Produced | 1935–present |
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| Variants | Wilson-Wotkyns .220 Arrow |
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|
| Parent case | 6mm Lee Navy |
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| Case type | Semi-rimmed, bottleneck |
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| Bullet diameter | .224 in (5.7 mm) |
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| Neck diameter | .260 in (6.6 mm) |
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| Shoulder diameter | .402 in (10.2 mm) |
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| Base diameter | .445 in (11.3 mm) |
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| Rim diameter | .473 in (12.0 mm) |
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| Case length | 2.205 in (56.0 mm) |
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| Overall length | 2.680, 2.580 H.P. bullets |
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| Case capacity | 47 gr H2O (3.0 cm3) |
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| Rifling twist | 1 in 14–16 in (360–410 mm) |
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| Primer type | Large rifle |
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| Maximum pressure | 62,000 psi (430 MPa) |
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| Maximum CUP | 54,000 CUP |
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|
|
|
| Bullet mass/type |
Velocity |
Energy |
| 40 gr (3 g) HP |
4,213 ft/s (1,284 m/s) |
1,577 ft⋅lbf (2,138 J) |
| 50 gr (3 g) SP |
3,947 ft/s (1,203 m/s) |
1,800 ft⋅lbf (2,400 J) |
| 55 gr (4 g) SP |
3,839 ft/s (1,170 m/s) |
1,800 ft⋅lbf (2,400 J) |
| 60 gr (4 g) SP |
3,647 ft/s (1,112 m/s) |
1,772 ft⋅lbf (2,403 J) |
|
| Source(s): Hodgdon |
The .220 Swift (5.56×56mmSR) is a semi-rimmed rifle cartridge developed by Winchester and introduced in 1935 for small game and varmint hunting. It was the first factory-loaded rifle cartridge with a muzzle velocity of over 1,200 m/s (4,000 ft/s).