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Old sewage pipes used to be made out of lead. I smelted many of them. Back in the day they wanted soft pipes to be easy to fit if adjustments were needed "on the spot". They are soft lead, great for muzzle loaders. Well, can be alloyed for bullets too.
Just make sure is lead before paying.
 
Live in Montreal right now the water lines coming in to the house in places are lead and they are slowly replacing them. I like getting my hands on the flange for installing toilets if I can.
 
Tin won't harden enough your soft lead. Tin is to make the alloy flow better in the mold. You need linotype or a hard lead alloy to give that soft lead hardness.
It is a sheet made buy a guy on castboolits who shows the hardness of different alloys and people claim they can use the sheet to mix components to get a certain hardness, I personally don't know how to use it other than finding the hardness of a certain material which I can find anyway with google.
I took the hard way to get a certain hardness by alloying pure lead with linotype in different quantities.
 
Is the lead from the old cast sewage pipes pure lead or mix ???. Looking to use to cast some bullets with it.
Bit of a small world. Back in the late 70's when I was keen on getting into casting my own bullets I received 200 + pounds of old lead pipe from Pollard Plumbing in North Bay, the guy was a friend of one of my bosses. The stuff was pure lead, a bit ripe some of it, but pure lead. He is gone now but I wouldn't hesitate for a second to use this sort of stuff if you can get hold of it. Lots of plumbers in North Bay and still probably a fair amount of lead pipe in older structures around that these guys would replace from time to time.
 
If you are going to load with black powder the pipe plus tin is going to be what you want. Tin can be bought but it's pricey. Last I bought was $18/lb. Solder or pewter is another good source.

If you are going to use smokeless then adding some wheel weight or linotype to harden it up some might be a good idea. It's not a high pressure cartridge so no matter what you are doing it shouldn't need to be all that hard.
 
I would suggest melting it into ingots & add small amounts to WW lead for rifle bullets.

That's what I've done with soft plumbing lead which I have quite a bit of now from various reno jobs. Use the pure stuff for shotgun slugs for now and possibly will be getting into some black powder #### down the road so will have a use for the stuff.
 
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