The 7.62mm Russian Nagant revolver fires a low-power, rimmed cartridge. Ammo is scarce, although Fiocchi made some not too long ago. If you can't find any, cases can be made from 32-20 Winchester cases.

Both the revolver and the cartridge are interesting designs. The revolver cams the cylinder forward and effectivly seals the barrel/cylinder gap. The cartridge has the bullet seated compleatly inside the case, probably to also aid in sealing gas pressure.

The 7.62x39mm Soviet cartridge is a medium power rifle cartridge intended for select fire carbines. It is neither similar to nor interchangable with the Nagant revolver cartridge.