What? Round balls shooting that good out of a fast twist barrel? Looks
Like respectably good groups for the UC's and RB's both! I would agree 65 grains is plenty for deer. I like 80-90 grains for conicals on elk, but it seems like overkill for 50 yd shots. I'm guessing your shots are close to that or less.

Just got my .54 GPH yesterday. Hope it shoots as well as your .50 cal. I will post some some pics of the before and after.....Even though the GPH isn't a replica of an actual period piece, I'll put the effort into tearing it down and browning the hardware and refinishing the walnut stock, etc. A couple weekends of work and these rifle can be made pretty purdy!