Re: 308 ammo
The surplus ammo is really 7.62 x 51 NATO and the commercial version is called 308 Winchester. The Accurate Arms (AA) reloading manual shows nominal case dimensions for both and they are the same. That should mean at least external dimensionally they are the same. The military brass is typically thicker but not so as to exceed the max external dimension listed in the AA manual
The next consideration is pressures. The SAMMI pressure limit for 308 is 52,000 PSI while another source says 7.62 x 51 NATO is limited to 50,000 PSI. That also seems to indicate that surplus 7.62 x 51 NATO ammo (surplus) can be used in a 308 firearm, pressure wise.
NATO ammo is suppose to be regulated so that NATO countries can interchange ammo in war time. That also would seem to indicate that surplus ammo is safe to shoot in a commercial gun.
Whether all these indicators are true or not is not certain. Countries tend to be independent and are just as likely as not to hot load ammo or download ammo. The only way to be sure is to cautiously use it the first time, observing the brass and primers for signs of excessive pressure. And do the same with every different batch.
I can tell you that my son-in-law does use military surplus 7.62 x 51 NATO ammo all the time with no problems. Of course, the safest ammo to use is commercial 308. Use any other at risk of problems and/or loss of the manufacturer's warrantee.