i was graveling a driveway for a customer of mine today and he showed me a round of ammunition that was left on his pickup bumper last light by persons unknown, along with the entire truck being keyed, the round is one i havent seen before it was marked .30 par and the last letter was either a or o, cant make it out, its size leaves me wondering what kind of gun shoots this round, either a large frame pistol or a rifle, were both thinking he was the victim of mistaken identity, he is in his mid 70's and pretty easy going, and his truck a early '90's era ford, cream color, isnt all that unusual, but the round has us courious, anybody know anything about it?