Please see: 4.5x40mmR
The 4.5x50mm SPP-1 cartridge is also known in many areas by other names, such as: 4.5x40mmR, 4.5x50mm SPP-1, 4.5mm Spetsialnyj Podvodnyj.
For complete information on this cartridge, Please See: 4.5x40mmR
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