When I find one that doesn't have definite minie ball characteristics (like Breezie's does), I weigh it and if it weighs in the right range, I give it the "benefit of the doubt". I have found a couple made of Colt pistol bullets. Once, after a poor day's hunt in a spot that had always produced relics, I only had five pieces of flat lead that were rolled into tubes. I found them all in a small area. I almost put them in the junk lead jug, but weighed one on a hunch. It was in the range so I carefully unrolled it with pliers and cloth the minimize the damage. It was a minie with three rings visible. I unrolled all five and all were the same. A bad day got better! I love the flattened bullets because they are soldier art in my mind.