Al (a lead inspector) posted this last year: "Lead in any form must be sealed (painted, coated or dipped) and may not be machined in the pit."
Thread here:
http://www.chiefdelphi.com/forums/sh...ad.php?t=76636
If it's fully contained it should be OK. You need to be careful when handling it at home, especially if you're doing any drilling or machining on it.
Keep in mind, though, that the only authoritative source of answers is the official Q&A at forums.usfirst.org. Nothing posted on CD, no matter who wrote it, will work as a defense if you get questioned by an inspector.