When Century rechambered these they had to remove the barrel and set it back a thread. In the process they had to remove a small tab the connects the forearm to the reciever. The only thing holding the forearm on the barrel on the 308s is a friction fit. When you shoot the 308s the forearm gradually works itself forward.
Do not buy the 308 version. 7.5 French ammo is not that hard to find, and not dramatically more expensive. Also the 7.5 French round is ever so slightly smaller than the 308. The bore will be slightly undersized for 308 bullets. It's safe enough, but accuracy will suffer.
I have one of the 7.5 versions. Decent enough rifle. Trigger is pretty stiff but otherwise it works about like any other milsurp bolt gun. A slip on recoil pad is a useful investment. Recoil isn't all that stout, but the length of pull on the buttstock is shorter than most other rifles.