I guess I'm a lucky guy. I have a giant pair of blacksmiths tin snips that are supported by one of the handles being fitted into the hardy hole of my anvil. These things cut lead sheet pretty well. Unfortunately most of the scrap lead I get, seems to have been cast into the largest possible hunk that a strong man can pick up, by some previous moronic owner. So, a saws-all or a power hacksaw, are what I use.
Hungry Horse