I just bought a used ruger blackhawk .44 mag revolver. I shot it yesterday and found it wasn' t very accurate over about 30 yards with open sights. I' m new to handguns and was wondering how a gun like this would work for whitetails. If I mount a scope on it would it work well out to 100 yards? I was told people use these with open sights at 100 yards, I can' t believe this. Can the barrel be replaced with a longer one and if so would that help accuracy? I' m hoping to try a handgun someday for deer, is a .44 powerful enough?