You want to stay away from having to use "Service Rifle Loading" My buddy bought the FN SCAR 20 in 308 and if you went to the store and bought a box of 308's it would pop the primers and jam the bolt in the closed position. It wasn't easy to clear. You had to get a flat screw driver and wedge the bolt back because you couldn't pound or pull it open.
You basically were stuck buying cases of NATO ammo
I attempted loading for it and even doing the min. load data down around 44,000 psi would still occasionally pop a primer. You have to use service rifle reloading tables. He ended up selling the heavy piece of junk. My AR-10's takes on max loaded for the loading tables. Like my chronographed 125 gr. Speer TNT pig rounds right at 3200 fps