the golden age of casting passed you by...time was, tire places would give you wheel weights and thank you for taking them, same with printing outfits for used linotype. those days are gone and folks pay big $$$ for casting materials; range lead is probably your best bet to keep costs down.
softer alloys work for low velocity ammo, maybe up to 1000 fps with proper lube, but hardener and gas checks are needed for stuff up to 1800 and beyond.
ditch the lyman lubrisizer! lee's tumble-lube and push-thru system is faster, cheaper, and works with any bullet...did i mention cheaper?
gave away my rcbs sizer-lubricator, top punches and sizer dies in favor of lee's system. check it out with a caliber you use...less than $20 for some liquid alox and sizer die set. you'll never look back!