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Double Rifles, Single Shots & Combinations >> Paradox and Bore Guns

Jim_C
.300 member

Reged: 09/08/14
Posts: 169
Loc: USA

Re: Alloy hardness for a 12 bore Paradox?
17/07/16 11:38 AM

Years ago (many years ago) when I corresponded with Elmer Keith, I asked for suggestions on the best alloy for slugs in a shotgun or Paradox. He replied that I should mix 7 pounds of plumbers lead with a pound of 50/50 bar solder. I always wondered where he got that recipe.

As for adding mercury, it is tricky to do. It fumes at the melting point of lead, so you really should do this in a fume hood. I did some limited testing based on old patent and research papers, and was able to confirm that an alloy of:

96.5% lead, with the remainder being trace elements
1.0% mercury
.8% calcium
.8% tin
.9% trace elements (primarily aluminum, copper, silver)

would consistently result in an alloy with a Brinell Hardness of 24. (Pure lead is 5.0 HB, wheelweights are often heat-treated to around 20 HB, Linotype is 22HB, many Babbitt alloys will go harder depending on composition.)

Then I lost access to the fume hood, and went back to the typemetals and Babbitts I'd been using without the worry about mercury poisoning!

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Subject	Posted by	Posted on
Alloy hardness for a 12 bore Paradox?	mart	17/07/16 04:37 AM
Re: Alloy hardness for a 12 bore Paradox?	CommandCar	24/07/16 02:46 AM
Re: Alloy hardness for a 12 bore Paradox?	mart	17/07/16 04:50 AM
Re: Alloy hardness for a 12 bore Paradox?	DarylS	17/07/16 06:14 AM
Re: Alloy hardness for a 12 bore Paradox?	MikeRowe	17/07/16 08:23 AM
Re: Alloy hardness for a 12 bore Paradox?	mart	17/07/16 10:00 AM
Re: Alloy hardness for a 12 bore Paradox?	DarylS	17/07/16 10:21 AM
Re: Alloy hardness for a 12 bore Paradox?	mart	17/07/16 10:31 AM
Re: Alloy hardness for a 12 bore Paradox?	Jim_C	17/07/16 11:38 AM
Re: Alloy hardness for a 12 bore Paradox?	DarylS	17/07/16 03:02 PM

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