Question: what is the difference between a 308 and a 7.62 x51?
Answer: 7.62 brass is a bit thicker, and commercial . 308 is sometimes loaded to slightly higher pressure, but other than that, the cartridges themselves are pretty much the same. If you want to be ultra-safe and conservative, fire only 7.62x51m NATO in 7.62 chambered rifles and . 308 Winchester in .