I found a bullet today that is silver and rather large. It has no rifling on it. It does have what appear to be machining striations like it was turned on a lather or something. It dulled my pocket knife when I tried to cut into it. I am guessing it is a 50 BMG armor piercing. I found info online that says there is a .50 AP Sabot round. That would explain the bullet having no rifling. The bullet was in great shape and the tip was only dented a little bit. Can any one shed more light on this mystery bullet or perhaps give me a better suggestion on what I found? Thanks