Sigh. So I was at Dunham Sports outside of Pittsburgh, PA tonight picking up a K-31. The guy in front of me was purchasing a CETME chambered for .308. But he had four boxes of 7.62x39mm Wolf sitting next to the rifle. B: "Pardon me, I don't mean to intrude, but are you planning to use that ammo in your CETME?" Guy: "Yeah." B: "It's not the correct ammo for that firearm." Guy: "Yeah it is, it's 7.62mm." B: "..." I didn't press any further. I probably should have, and I explained more ot the clerk later and asked to have the manager call the buyer to warn him, but their attitude was "He didn't seem to care, why should we?" At best, the ammo won't chamber and won't misfire from a primer strike. Worst case, it chambers and the guy has a rifle blow up in his face. Do I call the Dunham store tomorrow morning and ask to speak to the manager, explain again what happened, and ask them to call the buyer to warn him?