I'm thinking PMC Starfires.
I use them in my Commander, they expand like that and shed their lead core.
Man those look massive compared to the one we dug up last time.
My guess...a solid copper bullet in 45 acp from Taurus. They make 180 grain pure copper HPs. Otherwise, I could not imagine that any jacketed bullet would fully separate from its core so cleanly.
Here is Carbon's copper
Thanks. I will have to get some to try out. Can you imagine getting hit with that ?