Author Topic: lead tin alloys  (Read 2587 times)

Offline Bunk Stagnerg

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lead tin alloys
« on: September 04, 2016, 07:00:04 PM »

Straightening out the supply shelves and I came across some 5# blocks of lead I bought years ago from a well-known bullet alloy supplier. They are marked 1-30 lead tin ratio.
There are about 20 pounds of them and my question is would they be suitable for CAS Black Powder bullets or would that be too hard?
I have a couple of DD’s molds a 210 grain .452 for my revolvers and a 405 grain .457 for .45-70 Cody/Dixon shooting. In that case 100 yards would be about the maximum range they would be used. Right now I am casting all my bullets with pure lead especially balls for the front feeders. Did I find treasure?
Yr’ Obt’ Svt’
Bunk

Offline wildman1

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Re: lead tin alloys
« Reply #1 on: September 04, 2016, 07:35:03 PM »
That would be fine for CAS. 20-1 would be a good BP ratio.  Many buy 10-1 hard cast, however most of them are shooting smokiless. For long range some of the shooters use hardcast so they can get more velocity successfully. wM1
PS Pure lead is ok for RB but your alloy  will fill out the mold much better if it has tin in it.
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Offline Bunk Stagnerg

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Re: lead tin alloys
« Reply #2 on: September 04, 2016, 10:34:56 PM »
thanks as soon as it gets below 100 i will melt some and run some bullets.
Bunk

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Re: lead tin alloys
« Reply #3 on: Today at 02:52:42 AM »

Offline Steel Striker

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Re: lead tin alloys
« Reply #3 on: September 09, 2016, 09:30:35 PM »
Here's a sampling of data from these sources:

Sources and References:                        
www.lasc.us/SuperHard.htm                        
www.lasc.us/CastBulletNotes.htm                        
www.castboolits.gunloads.com                        
www.rotometals.com/Bullet-Casting-Alloys-s/5.htm                        
www.midwayusa.com/browse/BrowseProducts.aspx?tabId=1&categoryId=8662&categoryString=9315***685***                     
                     
I copied a section of my spreadsheet, so this formatting didn't hold up, but you can see the alloying relationships...

Description      Composition            Uses   Hardness   Est. Hardness
Pure Lead      (100% Lead)            Minies, Round   Brinell 5   8.6
Pure Tin      (100% Tin)            Alloy   Brinell 7   -
Pure Antimony      (100% Antimony)            Alloy   Brinell 50   -
Antimonial Lead      (5% Antimony, 95% Lead)            Alloy   Brinell ???   13.2
Super Hard Alloy      (30% Antimony, 70% Lead)            Alloy   Brinell ???   36.2
40 to 1 Alloy      (2.5% Tin, 97.5% Lead)            Blackpowder   Brinell 8   9.3
30 to 1 Alloy      (3% Tin, 97% Lead)            Blackpowder   Brinell 9   9.5
25 to 1 Alloy       (4% Tin, 96% Lead)            Blackpowder   Brinell 9   9.8
20 to 1 Alloy       (5% Tin, 95% Lead)            Blackpowder   Brinell 10   10.1
Chilled Shot      (2% Antimony, 98% Lead)            Shotgun   Brinell ???   10.4
Magnum Shot      (5% Antimony, 95% Lead)            Shotgun   Brinell ???   13.2
Wheel Weight - Stick On      (0.5% Tin, 99.5% Lead)            Minies, Round   Brinell 6   8.7
Wheel Weight - Clip On      (0.5% Tin, 2% Antimony, 97.5% Lead)            Pistol, Rifle   Brinell 12   10.6
Lyman's No. 2       (5% Tin, 5% Antimony, 90% Lead)            Pistol, Rifle   Brinell 15   14.7
Hardball Alloy      (2% Tin, 6% Antimony, 92% Lead)            Pistol, Rifle   Brinell 16   14.7
Linotype Alloy      (4% Tin, 12% Antimony, 84% Lead)            Alloy   Brinell 19   20.8
Monotype Alloy      (9% Tin, 19% Antimony, 72% Lead)            Alloy   Brinell 26   28.7



New to CAS, SASS #100144.  Obtained: Marlin 1894CB; New Vaquero's in .45LC; Win 1897 12ga cut to 20".  Looking to pick old brains.  Designed/built my very own dbl. CAS rig.  Putting a Dillon 550B to good use for my .45-70, .45LC., .44Mag, .45ACP, .38  I alloy lead & cast my own. 

Tent repairs & ammo belts, a hobby Blacksmith, woodworker & Boy Scout Ldr. & Lead Scrounger.

Offline August

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Re: lead tin alloys
« Reply #4 on: September 11, 2016, 01:24:43 PM »
I just keep adding tin until the bullets fill out the mould.  I think of the tin as important to the casting process, but not at all important to shooting at the velocities we work with.  So, you'll know when you start casting whether the amount of tin is sufficient to fill out the mould.  Have some 50/50 solder on hand in case more tin is required for getting your casting done.

 

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