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Joined: Nov 2004
Posts: 9,984
Campfire Outfitter
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OP
Campfire Outfitter
Joined: Nov 2004
Posts: 9,984 |
I just got back into casting last year and I've been trying to come up with a good all around alloy mostly for handguns up to around 1200 fps.
I have several hundred pounds of monotype I bought from an old printshop. I had a scrap yard xray gun some of it and it has 74.53% lead, 17.74% Sn and 7.73% Sb . It's hard stuff so I've been adding one pound of it for every 4 pounds of wheel weight lead. Seems to work so far but I have no idea how hard it really is and what alloy blend it would be similar too.
What would your guess be on this blend? Do you recommend I do it differently? I've hit some bullets with a hammer after cast and they start to flatten out some but don't fracture or break.
Thanks,
Bb
Last edited by Burleyboy; 03/31/22.
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Joined: Nov 2004
Posts: 9,984
Campfire Outfitter
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OP
Campfire Outfitter
Joined: Nov 2004
Posts: 9,984 |
If I did my math correctly, based on what alloy estimates online that show 95% lead, 0.5 tin, and 4 of Sb, my alloy after blending should be approximately 91% lead, 2% tin, 6.75% antimony and some trace arsenic and other ww inputs.
So I'm basically casting 91Pb, 6.75 SB, and 2 Sn. Whatever it is it seems to work in my limited testing and seems to be medium hardness air dropped yet will not fracture.
Is there a better blend I could try? I have maybe 1000 pounds of this monotype left. I actually have more of it than I do ww lead.
Bb
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Joined: Aug 2015
Posts: 13,232
Campfire Outfitter
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Campfire Outfitter
Joined: Aug 2015
Posts: 13,232 |
I've used pencil hardness testing on range salvage lead when I cast ingots to see what I have. Done properly it is accurate and inexpensive. It will give you a good idea of what you have. Pencil hardness testing lead.
Let's Go Brandon! FJB
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Joined: May 2004
Posts: 56,082
Campfire Kahuna
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Campfire Kahuna
Joined: May 2004
Posts: 56,082 |
Have never pursued the pencil test, but do have a Lee hardness tester. It is quiet simple and accurate. Bought mine when they were $30-35, but I see these days they are $70 from Amazon and $100 from Lee. Simple test? Shoot it and if it works move on down the road. Might find some insights that simplify thing on this website. http://www.lasc.us/CastBulletNotes.htmLooking at notes you will see hardness values for various alloys, to include monotype. Hardness is reasonably linear as an alloy ratio. Alloy BHN Lead 5 WW (stick on) 6 Tin 7 1 to 40 tin lead 8 1 to 30 tin lead 9 1 to 20 tin lead 10 1 to 10 tin lead 11 WW (clip on) 12 Lead Shot* 13 Lyman # 2 15 Water quenched WW 18 Linotype 18 - 19 Monotype 25 - 27 Oven heat treated WW 30 - 32 Antimony 50
Last edited by DigitalDan; 03/31/22.
I am..........disturbed.
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