I guess I'm not understanding how you're checking for anything besides minor surface hardening. I assume you know that even fully annealed pure copper is too hard for expansion of a solid bullet in deer; so are you forming some sort of hollow point, or what am I missing there?
Don't get me wrong, if you've figured out something useful I'm all ears and interested in learning about it.
Last edited by Yondering; 12/16/17.
