I just bought a used made in '99 blued 4 5/8" 45 convertible Blackhawk, which I am picking up on Saturday. I want to be able to shoot some of the Double Tap 335gr. loads through it, and want to know what I should expect as far as accuracy goes with this or similar loads in such a short barrel? As far as I know the front sight is fixed and the blade can't be replaced with a taller one, right? Is the rear sight going to have enough adjustment in it to allow me to shoot these loads accurately?