The top one, of course, not a Bisley but an Old Model .357 Blackhawk. Middle is a .44 mag with shortened 5" barrel. This one may have left the factory as a Super Blackhawk and been converted later. Bottom is a .45 Colt with Wiegand scope mount and Tasco ProPoint.
Here's my Bisley Hunter in .44 Mag -- soon to become something much larger:
And while not technically a Ruger, here is my DMax (essentially a stretched Blackhawk) in .50 Alaskan, with a Bisley grip frame and custom Micarta grips: