A friend of mine has this site on his Ruger Blackhawk .45 Colt w/4 5/8" barrel........on our last camping / scouting trip together I shot it a fair amount. Even though I am a fan of peep sights on rifles, I didn't think I would like one on a handgun, well........
My opinion is this: they make a good rear sight for fast shooting at moderate distances, but not good for precision work (aka: hitting small targets or shooting for small groups). But for big game hunting at closer ranges, especially on a moving animal, I think it would work great. He carries his .45 Colt & 300 grn LBT's w/ top loads recommended for only for Rugers, it's his bear protection gun, and I think it is a great set up!!
Del