Hey Doc,
I agree with Wink, 30 yds at the maximum. If you are hunting in muzzleloading only season, be sure to check the hunting regs real close. Here in Arizona Rifle or handgun in muzzleloading only season must be loaded from the muzzle only, and fire only one projectile from the one barrel. I have a friend who has a custom flinter with a rotating barrel that has two seperate barrels on it and he has to use it during the general hunting season here. Arizona does have a seperate handgun season on Javalina that would allow bothe black powder revolver and muzzleloading handguns to be used. That is the only handgun season we have here.
Till Later,
Pahu Aska