I have a CVA 45 cal pistol that I use for a backup.at times I have stalked hogs with it alone.it makes close and personal have a different meaning.
CVA makes some nice ones,as well as kits you can build yourslef.that is what I did. it seem different to hunt with a gun you built yourslef.

#1 40 to 45 yards is as far as I will atempt to take an animal with a B/P pistol. I prefer closer if possible.depends on your skill.

#2 44 and 45 cal. is the norm.there are some 36 cal. but not for big game.that is not for me.I prefer something a bit larger,to respect the animal and make a good kill.

#3 in my state it "IS" legal to hunt with a B/P revolver.

good luck in finding you a good pistol to hunt with.It is fun to know you only have one shot to do what you need to do.[8D]