While pure lead is best, lead alloys are usable.
I have fired many thousands of round ball loads using wheel weights with no ill effects to the firearms. If the alloy is really hard the rifling will have a difficult time engraving the bore through the patch. Keep the casting temp as low as possible and do not drop the wheel weight balls into water straight out of the mold blocks.
As for the parch lube;
Just about anything can be used for patch lube. Bacon grease would work, so will bear grease, lard, beef tallow or plain old spit.
I know target shooters that stand on the firing line chewing the next patch they will use to load their rifle.
I also know target shooters that use obscure formulas of lubricant combinations they apparently obtained from some Swahili witch doctor. The names are legend; moose snot, lizard slobber, mouse milk.
I never really noticed them shooting any better than another concoction.
I have always considered Crisco or some other shortening as a reliable and cheap back up lube. I even grabbed the can of Pam cooking spray off the kitchen stove, soaked my patches with it and had good results.