I use wheelwights in everything.
That being said, I have no idea what I am doing. I just bought a 55 gallon drum of wheelweights at the junkyard and started casting bullets. Used them in all manor of revolvers and rifles. But, I never made any attempt to see how fast I could push them or anything. I was just using them for light practice loads.
You know the rest. In the books you have read
How the British Regulars fired and fled,
How the farmers gave them ball for ball,
From behind each fence and farmyard wall,
Chasing the redcoats down the lane,
Then crossing the fields to emerge again
Under the trees at the turn of the road,
And only pausing to fire and load.