308 & 7.62x51 (7.62NATO) are completely interchangeable except for the rare, out of headspace spec mil-surp. The blow up in your face myth comes from people misinterpreting data from when they were pressure tested, 308 with the piezo method using PSI as it's unit of pressure and 7.62x51 was tested using the crush copper method with units of CUP (Copper Units of Pressure) being used.
The results were
7.62x51 50,000 CUP
308 62,000 PSI
People keep changing the letters CUP to PSI and then do a chicken little act.
Tested the same way using the same units they're within a hair of each other in pressure. Check reloading manuals, same loads for both. Consider this, if 7.62x51 really was only 50k PSI then how the heck would it produce the same ballistics as 308? Where would the energy be coming from? No magic allowed. And besides, per NATO specs, 7.62NATO chambers are rated to 75k PSI.
There are however two slight differences between the two which mean zip for 99.9999999% of rifles
1) A slight headspce difference which is only an issue if your rifle's headspace is out of whack.
2) Slightly thicker casing on NATO spec rounds.
Do a search, there must be a couple of dozen thread explaining this