Very interesting that Gun Jesus says the FR7 can handle the 7.62 NATO cartridge.
It can. It's all I've ever run through mine, and although I've only a few hundred rounds through it (it isn't a high volume shooter for me), there's been no headspace shift or peening.
I lucked out with mine. It had been unfired since the rebuild (pics of the bolt face and bore below, from the time I bought it). It went from the arsenal, to a rack in the armory, to the surplus market, to someone who believed the #$%^ about them having a weak action, so he was too scared to shoot it, then to me. It was a guilty pleasure to pop the cherry on that gun.
I've run a few different types of surplus through it. Its favorite is some South African (not quite NATO spec, a bit hotter actually) surplus I got a pile of ages ago on a trade. 2&1/2" groups at 100 when I'm doing my bit, as much as my eyes will allow. Which is about as good as I get with irons. Worst is that Hirtenberger stuff that floats around, which I can't get better than 4&1/2" with. YMMV, every gun has its preference.
There's enough of these floating around, with people running NATO spec and commercial .308 from them, that if there was an actual problem running this ammo through them, well, there would be more than one random pic of a blown up action to show for it. My guess is the blown action was from an un-careful handload, which has been the death of many a fine rifle over the years.
Having said that... "Old guns are old" and need to be treated accordingly. They aren't the guns you want to be testing out your personal hot hand load on, and you should keep them clean, and keep an eye out for bolt lug deformation and peening. Other than that, if you have one, shoot it like you would any other 7.62NATO specced gun.