Wheel weights are an ALLOY..
Long before I got the smoothie fix :cursing:
I was casting my own center fire pistol ammo... still do..
I love W/W's.. however.. you still need to add a little tin to them..
I still have a large stash of Linotype..Which is an obsolete material and no longer made.
The point is that tin, makes the metal flow better and adds to the "flexibility" and hardness of it.
Round balls if used in a rifle should be as "pure lead" as possible. Because of the hardness.. that's the only reason.
Try pushing a "pure lead .490" down the bore vrs an "alloy .490" and you will see what I mean.
With a smooth bore.. it's not the ball size, but the patch and the fowling.
BTW.. If you get a ball stuck in a smooth bore..BFD.. Oil it and wait.
Then you can bounce it out. Using the same techniques as a kinetic hammer.