Those that use SAAMI as the bible, are still listening to their 8 Track, driving their Biscayne (with the factory tires), and are sure thet their butterflied collar shirts are going to be back in fashon this year.
7.62 NATO, and 5.56 NATO vs. .308 Winchester and .223 Remington. Standard vs. Metric.
Yes, there are small diferences in the throat dimensions.
For the most part you may interchange metric vs. standard ammo. Their are a couple of exceptions, such as 7.62mm machine gun ammo(linked/delinked) that just does not like the slightly smaller chamber/throat of the .308.
The same is true of several 5.56 NATO machine gun stuff.
The pressures that SAAMI provides are "tuned" for the weakest possible rifles.
Sorry to ramble, but, SAAMI just makes me angry.
Yes you can shot (most) 7.62 out of a .308
Lew
Edited, cause I spelled SAAMI wrong....