The 5.45×39mm PSP cartridge is a rimless bottlenecked intermediate cartridge. It was introduced into service in 2005 together with ADS amphibious rifle by Russia. This special cartridge was made for underwater use in ADS rifle and based on standard 5.45×39mm.
Quick Facts Type, Place of origin ...
| 5.45×39mm PSP |
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 5.45×39mm PSP cartridge |
| Type | Rifle |
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| Place of origin | Russia |
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| In service | 2005–present |
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| Used by | Russian Federation |
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| Designer | KBP Instrument Design Bureau |
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| Designed | 2005 |
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| Case type | Steel, rimless, bottleneck |
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| Bullet diameter | 5.60 mm (0.220 in) |
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| Neck diameter | 6.29 mm (0.248 in) |
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| Shoulder diameter | 9.25 mm (0.364 in) |
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| Base diameter | 10.00 mm (0.394 in) |
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| Rim diameter | 10.00 mm (0.394 in) |
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| Rim thickness | 1.50 mm (0.059 in) |
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| Case length | 39.82 mm (1.568 in) |
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| Overall length | 57.00 mm (2.244 in) |
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| Case capacity | 1.74 cm3 (26.9 gr H2O) |
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| Rifling twist | 255 mm (1 in 10 inch) or
200 mm (1 in 7.87 inch) |
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| Primer type | Berdan |
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| Maximum pressure | 380.00 MPa (55,114 psi) |
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| Bullet mass/type |
Velocity |
Energy |
| 16.4 g (253 gr) PSP Tungsten bullet |
333 m/s (1,090 ft/s) |
909 J (670 ft⋅lbf) |
| 14.5 g (224 gr) PSP-UD Bronze bullet |
430 m/s (1,400 ft/s) |
1,340 J (990 ft⋅lbf) |
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| Test barrel length: 418 mm (16.5 in) ADS amphibious rifle |
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There are two variants of it. PSP with heavy 16.4g tungsten alloy bullet and PSP-UD with 14.5g bronze bullet.[1][2]
