Don,
I have not done it myself but have heard of what Dendy Cromer has done above. I've actually heard of using #2 lead shot from shot shells, if you can still find them and your increments would be easy i.e. 3 shot pieces per BH, etc.
Fishing split shots, melted and poured into a mildly heated ferrule would likely be my choice.
Man…you collect BH's, just shoot a heavier head! What weight do you want, 200 grns. + ? Lets trade something or I'll give you something heavier
I have a bunch of 190 RW Grizzly’s.
Thanks for the rabbit hunt the other weekend...tons of fun!
Kris