cerrosafe

[fast ronnie]

This is probably not the right place to post this thread, but here goes any way.

I have a rifle I need to chamber cast. I need to buy some cerrosafe. McMaster Carr lists these different metals, but I don't know which one is correct for what we do. If anyone can elaborate, I would like to hear from you.



Bismuth Alloy

Material Composition

Approximate

Melting
Temperature, °F Bismuth Lead Tin Cadmium Thick. Wd. Lg. Wt.,
lbs. Shape Each
158° 50% 27% 13% 10% 1/2" 3" __ 1 1/2 Hex 8921K12 $48.78
160° 43% 38% 11% 8% 5/8" 1 1/2" 4 1/2" 1 1/2 Bar 8921K22 45.78
203° 53% 32% 15% __ 1" 1" 3" 1 1/2 Bar 8921K23 49.89
255° 56% 44% __ __ 1/2" 3" 3" 1 1/2 Square 8921K14 45.09
281° 40% __ 60% __ 1/2" 1 1/2" 4 1/2" 1 1/2 Bar 8921K18 64.80
281° 58% __ 42% __ 5/8" 1 1/2" 5 1/2" 1 1/2 Bar 8921K16 63.84
Indium Alloy

Material Composition

Approximate

Melting
Temperature, °F Bismuth Lead Indium Tin Cadmium Thick. Wd. Lg. Dia. Wt.,
lbs. Shape Each
117° 45% 23% 19% 8% 5% 1/4" 2" 4 1/2" __ 1/2 Bar 88635K2 $101.84
134° 48% 25% 5% 13% 9% 1/2" __ __ 3 1/2" 1 1/2 Disc 88635K26 133.56
136° 49% 18% 21% 12% __ 1/4" 1 7/8" 4 1/2" __ 1/2 Bar 88635K4 111.04
142° 48% 25% 4% 13% 10% 1/2" __ __ 3 1/2" 1 1/2 Disc 88635K28 117.72


Material
Composition

Approximate

Melting
Temperature, °F Lead Antimony Thick. Wd. Lg. Wt.,
lbs. Shape Each
430° 94% 6% 1 1/8" 1 5/8" 6 5/8" 5 Bar 9045K11 $28.77[SIZE=5]

[Gewehr-Guy]

I use some I bought from Roto Metals, and I think it was the 158 degree stuff, worked very well for me. I melted it in a soup can in another pan of near boiling water. I need to get some more.

[Newboy]

Yes, you can buy a low melting alloy somewhere. But the reason to buy Certosafe from Brownell's or somewhere, is because of the known data regarding times and shrinkage factors.


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[largom]

I have always used the 158 Deg. metal.

[fast ronnie]

For what it's worth, I just looked it up on a chemist site. The correct answer is #2. Alloy is as follows:

Melting
Temperature, °F Bismuth Lead Tin Cadmium Thick. Wd. Lg. Wt.,
lbs. Shape Each

160° 43% 38% 11% 8% 5/8" 1 1/2" 4 1/2" 1 1/2 Bar 8921K22 45.78