Just a couple of thoughts.
1. If you are going to carry a handgun as a back up while hunting (BP?ML, [size=150]BE SURE YOU CHECK YOUR STATE REG.s [/size] Some states "Allow" Ball ammo, some DO NOT.
2. Is the hand gun going to be used ONLY for "hunting, or also for your general BP/ML use
A. Hunting only = .62 cal smoothbore would work. Same cal. as your rifle, plus can be loaded w/shot for "snakes"
B. General Purpose = .44 - .54 cal RIFLED. ( a "smoothy leaves a LOT to be desired as to accurcy. Why the smaller cal.?? Because IMHO, they are more avail. & easier to "handle."
C. Flint or Cap = If your rifle is flint, then your hand gun should also be, IMHO. As to "reliability", Just as reliable as you Rifle.
3. Cost = Just as a GOOD rifle, a GOOD Hand gun will cost, Depends on what you want.(example, my Pedersoli's are now about $1,000.00
Puffer