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the 7.62 nato round is loaded to around 55000 psi and the .308 win cartridge is loaded to around 65000 psi. if you have a rifle proofed for the .308 win. then you are safe to fire both

The 308 and the 7.62 x 51 are essentially the same size with the 308 being loaded to higher pressure. The 7.62 x 39 is a different round entirely and much smaller. Any 308 will fire both 308 and 7.62 x 51 ammo but, the 7.62 x 39 will only fire 7.62 x 39 ammunition.

Any 308 will fire both 308 and 7.62 x 51 ammo but, the 7.62 x 39 will only fire 7.62 x 39 ammo

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There are many rifles that will fire 308/7.62 Nato. Stick with American made ammo and you'll have no problems. The 7.62 Nato can be made to the top limit of it's head space dimension and not be a good fit in the 308. American manufacturers load it to fit. I had a guy with a 308 rifle wednesday that was having problems with some European 7.62 ammo. He showed up today with 308 winchester and had no problems.