I shot a small doe with my 58 Zouave this fall - holy crap! A mere 75 grains of OE 1.5F and a PRB and the thing had huge entrance and exit holes, there was about enough heart left to frame the hole, and the torso even had some bloodshot meat.
I expect to finally land a modern rifle tag for deer next year, so it will likely mean a break from muzzleloader hunting. I plan to fool around with minies and a REAL in this rifle. The smallest minie design I have is 400 grains and the REAL is 440 grains. Definitely more whomp than necessary for white tails, but I figured they would be fun to fool with.