Lead-Tin alloy ratios

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  • Last Post 23 February 2016
.22-10-45 posted this 21 February 2016

Hello, I have 10# of 40-1 pure lead/tin alloy which is 2.5% tin  97.5 lead.  If I wanted to change this to a harder 30-1 lead-tin alloy, would adding .5% ...350grs. tin be close enough?  Thanks!

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RicinYakima posted this 21 February 2016

Close enough, unless you want to try 362.5 grains. Your math is OK.

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.22-10-45 posted this 22 February 2016

I forgot to mention the only form of tin I have is 50-50 solder bars & wire. If I add tin in this form..1/2 will be pure lead which I already have too much of..can you help my math challenged brain to figure this out? Thanks!

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Paul Pollard posted this 23 February 2016

If you really, really want to use the 50/50 solder, you will need to get 10 lbs of pure lead. Then add 11 ounces of 50/50 solder to the 10 lbs lead. Should be close. 96.78% lead and 3.22% tin. Close to 30:1 lead/tin.

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mike0841 posted this 23 February 2016

Below is an Excel spread sheet you can download and use for alloy composition.  The sheet works excellent and I use it all the time.  Just click on the link and the sheet will download to your computer.  It is also available on the web site under Downloads/Alloy Calculator.  Hope this helps with your alloying.

http://castbulletassoc.org/downloads/Alloy12.xls>Alloy Calculator

Mike CBA Webmaster

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.22-10-45 posted this 23 February 2016

Thanks..I did use alloy calculator..came up with .18lb. (2.88 OZ.) of 50-50 solder to 10# 40-1 for a final alloy of 3.28% tin & 96.7% lead. Pretty close. I have used lead-tin alloys for a long time..just never had to go the other way. Thanks alot!

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