I tried WW alloy for my .56 renegade, and the balls came out oversized, I could hardly ram them down on top of the powder. Then I tried pure lead from old pipes, and they were ok. I would guess if you used the WW alloy they dont shrink like pure lead does so you would need to use a thinner patch. Everything I have read though says use pure lead.
I would save the WW for your centerfires.