7.62 NATO isn’t the same as .308 Winchester. The winchester cartridge is more powerful and isn’t recommended for surplus rifles
The only problems I know of with shooting .308 in a surplus rifle came when someone I know got the bright idea to try some 'light' loads with powder salvaged from some IMI blanks because he thought it looked like BLC-2.
He lucked out, with only minor injuries, and the local Hunter Safety Class got the rifle (actually, what was left of it) as an object example of what NOT to do at a reloading bench.
I could have kicked him, and he knew better, too.