Russian Mouser .308 help with ammo I have a friend who is sending me a free (+ shipping and transfer fees) new Russian Mouser .308/7.62 rifle. What ammo does this use? I'm so confused. Is it .308? 7.62x39? 7.62x54? 7.62x51? What do those designations mean? I assume the .308 is the diameter of the round in inches, but that converts to 7.82mm. So that doesn't make sense. And is the x39, x51 and x54 referring to load capacity? I like Phillips screwdrivers. You have size 0, 1 and 2. Can't they just make a #1 gun? What's up with all this? Can you tell I'm sort of new to all this?