Some info on turning copper bullets can be gleaned from the following folks. They were great with some virtually perfect 6.8 SPC bullets for a test a while back. You’ll also find a little terminal ballistics info there.
GS Custom Bullets
http://gscustom.co.za/
[familyop: Use a hefty flow of good coolant, IMO (re, copper’s radical expansion with heat noticed in other kinds of custom jobs in the past, IIRC).]
Good Link...grateful !
BTW was looking at my daily video sites I bookmark and found this guy . Awesome video, though ya might enjoy it as well .
http://www.wimp.com/footpowered/
Stay safe !