Clip-on wheel weights- yes.
Stick-on wheel weights are soft nearly pure lead- ok as a basis for further alloying.
Zinc wheel wheel wights- death to your alloy. Avoid at all costs.
1-20 tin/lead- a little bit of a waste of tin. 1-30 would be just fine for your needs.
If in doubt, start out by buying some soft relatively pure tin and enough tin to work up a small-ish batch of 1-30 alloy and take it from there.
In a black powder cartridge such as yours, there's no need to cast hard-as-nails bullets; soft is ok. Size them to perfectly match your throat (ignoring the groove diameter), lube them with a black powder-friendly soft lube (if shooting black powder, and there's no reason not to), fill the case with enough black powder so the bullet just starts to crush it when seating. All that = the basics for what you're up to.
Last edited by gnoahhh; 04/24/17.
