There's a part of me that wants to use a modern aerodynamic bullet (SST, FTX, FPB, etc.), but it seem almost as bad as attaching a modern Nikon scope. I'm not sure if I care enough though. I did put a modern sling on my Deerstalker that has fiber optic sights, a modern stock design, and a rubber recoil pad...
I'm not planning on joining any historical club, though I think it'd be a lot of fun. I'd bet a coon skin cap would fit me well!