Pure lead seems hard to find, I still have a bunch left over from the factory where I used to work.
Only a couple of hundred lbs, so still looking for more.
Processed the two buckets that I picked up, lots of different kinds, have to be careful, some with zinc.
According to Lee's chapter on casting, zinc is bad.
After a while, you can kinda tell which one are O.K.,I use a "scratch test" with an awl, to tell how hard they are.
Some are even marked Zn for zinc, or Fe for iron.
Zinc melts at about 1400 degrees I think, the pot gets to 900 degrees, so I don't think I have had a problem, so far.
Some are marked "Micro" and seem very soft, some marked "M.C." and "AL-MC" don't know for sure, but they passed the "scratch test" so I melted them.
Some other marking are "T", seems hard, but melt, some marked "P" seem O.K.
Kinda make you wonder if there is a data base on markings?
Got my .357 6 cavity dies in the other day, didn't realize that they didn't come with handles, the round ball and the shot gun slug dies did, so had to reorder and wait.
Came in yesterday, so poured a few hundred .357's to day, not to many "culls" after I got the dies up to temp, and my technique down.
Coated with Lee's Alox and they are drying right now.
Since I paid about $60 bucks for 450 bullets last time around for the .357, I think I am already ahead of the game.
Found this site WOW, lots of detailed info
http://www.lasc.us/CastBulletNotes.htm