Enfield2B,

lead tin alloys do not to any degree change over time, at least the rations I use for BPCR's, between 16:1 for PP and 20:1 by weight for canuallared/GG bullets (but just starting to play with PP)

But the OP was talking Linotype,which has antimony and tin, all be it more antimony that tin.

If you look up articles by Dan Theodore you will find some good info. Bottom line if alloying lead, tin and antimony is never have more tin that antimony, (here you go, for some info: http://www.shilohrifle.com/forums/viewtopic.php?t=24564 )

Re. wheel weights - concur, that is why I said 'old wheel weights', zinc has no real place in cast 'boolits' IMHO

Brgds Terry