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Pastimes : Don't Ask Rambi -- Ignore unavailable to you. Want to Upgrade?

To: Ilaine who wrote (51675)	6/2/2000 1:28:00 PM
From: Jacques Chitte	Read Replies (2) \| Respond to of 71178

I'm as fascinated by metal type as you are! No stubbornness needed. There are three Type allows. Linotype (84/12/4) lead-antimony-tin is the softest. Next comes Monotype, and hardest or most antimonial is Stereotype alloy. I forget the proportions of tha latter two, but 72/18/10 sounds right for Stereotype. Linotype alloy as cast has a Brinell hardness of 28-30. I think Linotype is a eutectic, that means it is an alloy whose proportions give it a uniform low melting pint. Wheelweights (94.5/5/0.5) on the other hand have a broad melting range, and as the melt cools it can go through an "oatmealy" stage as lead crystals thicken up a melt of more antimonial lead. For good mold fill-out, two to three per cent tin are a desirable minimum. Slugs cast of wheelweights invariably look a little "frosty". And slugs cast of pure 99+% lead have often given me melt lines - little creases where the lead solidified and formed a stratified look. Some tin works wonders to iron out the melt lines. Elmer Keith, perhaps the greatest authority on practical shooting this century has spawned, cast all his handgun bullets, even the heavy magnum slugs, from a fairly soft 16:1 lead-tin alloy. This has a Brinell number of 10 to 11.