I guess I am a little different, I pick up range lead at a range where they only shoot BP guns, some is obviously wheel weight lead, I can tell because it doesn't deform much when it hits the chirty berm. I once separated the softer lead that I called splatter lead because it would be mushroomed when it hit the berm, but now I mix it all together.
Balls I cast from this lead works well on targets and kills deer dead, that is good enough for me.
The little wafer on top is civil war lead, last time I posted a picture of melting it down people had a cow about its "historical" value. There wasn't one piece of lead in the pile that was a discernable projectile. One of my friends died whose brother was a relic hunter, he had picked up the lead in his travels, no telling where it came from, he was deceased as well.
The brother had a huge collection of civil war artifacts, everything you could think of, even rifles. His collection of intact projectiles was extensive.
My friend that died got in a financial bind and sold the collection to to another collector for a song. When he told me what he sold it for I could only shake my head in disbelief. My friend didn't have good sense at times, this was one of them.