I melted a lot of lead down over the years. I started out with a small cast iron pot that had a coil in it it. I have a larger electric pot now, that does great job. It has a spigot on the bottom, and the pot stays still. It also has a temperature control. Lead starts emitting toxic fumes at 1200 degrees. You really don't need it to be hotter than about 650, unless you are adding a lot to the pot and moving fast.
I used to go pick up wheel weights by the bucket full at the local tire places. They were glad to get rid of them. Then over time, they asked me to buy them, then they started recycling them, themselves.
I melted the wheel weights into ingots. Then over time I started selling Dive-weights on E-Bay. Basically, I was getting at least .99 cents a pound for lead that was being given to me. Sometimes they went as high as $2.00 a pound, if folks were fighting over the auction. Not a bad deal while it lasted. ;-)
I used welding gloves, a spoon and a pair of needle nose pliers. I would grab the clip with the pliers, tap it on the side to keep all of the crap in the pot, toss it in a tin pail, and repeat. Once I had all of the clips out, and there wasn't any more room to add any more, I would use the spoon to stir the pot, and make sure everything was floating then scoop the dross off and toss that into the same bucket. Some of those clips are stainless, but it's a crap grade and my local recycler would only give me tin price. But that was for the dross and everything. If I remember correctly, two 5 gallon buckets full of dross and clips got me a check for $4 bucks. ;-) lol
As for pouring into a mold, the best advice I've found is to pre-heat your mold.
At first I placed the mold on top of the pot, but that was VERY time consuming, and didn't work very well. Then I would pour a warming cast, to get the mold hot, and then make the real cast. That worked, but the better was to buy a two burner electric hot plate, and the molds would sit on the burners and get very hot, while I melted lead. By pre-heating the molds, you get a very good finish on the lead, if it's poured into a hot mold and allowed to cool slowly. You'll be pleased with the difference. If the finish is still rough, you may need to polish the inside of the mold.
As for flux, I never used any. Never used sawdust. The wheel weights were usually clean enough that I didn't get an incredible amount of crap that needed to be removed, but everything that DID need to come out, was floating, and I scooped it out with the old spoon.
Bullets were doable too, but they are another story. ;-)
Good luck. :-)
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