If you're casting ball for PRB in a rifle then any wheel weight will do but for the C&B revolvers I would suggest only the Adhesive Wheel Weights.
Clip On Wheel Weights are 95% Lead, 2.5% Antimony, 1% Tin & 1.5% Trace Elements & would be pretty hard for Muzzle Loading Ball "can be used" & Conicals not to mention that the finished projectile would be about .002 avg. larger than stated size on the mold "so patch adjustment may be necessary for PRB."
Adhesive Wheel Weights are 98% Lead, .75% Tin, .50% Antimony, & .75% Trace Elements & are quite soft enough for Muzzle Loading Ball & Conicals.
I've been using Adhesive W.W. for several years taking several Deer & loads of targets with them, I shoot .457 Ball out of all my C&B Revolvers too using the same Lead & they are as easy to load as Store Bought Hornady .457's.