Question: what is the difference between a 308 and 7.62x39?
Answer: 308 Winchester is another name for 7.62x51mm NATO. Not only is the case longer, but that extra case length is used for more powder, meaning that . 308 has more power than 7.62x39mm (7.62 Russian for short). In fact, it has so much more power, it's in a whole different class of cartridge: .