Lewis Lead Remover.
I don't know if these are still on the market or not. It's a threaded bore rod with a number of special jigs and a supply of pre-cut brass screen discs. You drag the screen through the bore with the rod, and lead shavings fall out on the bench. It's by far the best de-leader I ever used.
JLF
Complete thread:
- Linebaugh Custom 45 Colt - 
AkRay, 
2012-10-14, 21:59 
- Linebaugh Custom 45 Colt - Paul, 2012-10-15, 00:59
 - Linebaugh Custom 45 Colt - 
Sarge, 
2012-10-15, 08:57
- Lewis Lead Remover. - 
JLF, 
2012-10-15, 11:40
- Lewis Lead Remover is available at MO Bullet Co. - 
Sarge, 
2012-10-15, 23:46
- Brownells had them, probably still do - Cherokee, 2012-10-16, 18:24
 
 
 - Lewis Lead Remover is available at MO Bullet Co. - 
Sarge, 
2012-10-15, 23:46
 
 - Lewis Lead Remover. - 
JLF, 
2012-10-15, 11:40
 - Another one??? Does this mean you will selling off those - 
Rob Leahy, 
2012-10-15, 09:30
- Sell off? If I find one or two more, I can start to be a - AkRay, 2012-10-15, 15:37
 
 - Lead removal - Art, 2012-10-15, 18:15