I'm also a metal caster, have not done any castings for several years. My preferance is automotive aluminum.
First image is a fishing weight mold used to cast lead weights.
Try some tire shops that cater to the domestic crowd then dont forget the commercial transport shops they usually have a good supply of damaged rims that you can purchase at scrap price or slightly above to sweeten the pot. Transmission repair shops, sometimes a trans case will be damaged beyound useable conditioon.
Machine shops that specialise in head rebuilding will have heads damaged and not worth repairing heading to the scrap bin.
Also noticed you have a lot of up pull and pick a parts auto salvage yards to choose from, go for the damaged aluminum rims they'll be glad to have you as a customer.
Marinas that repair boat engines would also produce a good waste stream of aluminum also look at some of the recerational dealers that sell and servioce snow mobiles and motor cycles and such, any small air ports near you - drop in and speak with one of the mechanics a lot of the parts used on aircraft engines is aluminum.
Agricultural shops that sell and service farm tractors, check out the bins on the back lot, car dealerships usually have junk laying around but you need to ask as it maybe a valuble core waiting to be shipped back on warranty.
Small engine reapair shops that fix mowers have tons of scrap aluminum engines, forget the transmissions you'll be paying for to much iron and have to deal with the heavy oil.
If you find an old barbecue in the scrap leave it there, that's where it belongs it's the worse scrap I've worked with for metal casting waaay to much dross.
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