.....One of my favorite holsters of all time was the Chapman High-Ride. It was touted as a match holster; though I see nothing wrong with it for Duty or Field use.
.....Be that as it may. Bianchi doesn't make them anymore.
.....I'm sure it was a fairly complicated holster to make. It had a massive steel insert; an adjustable tension screw; and a couple other brass screws.
.....I'm reasonably sure that I need to practice on a few simpler holsters first. I'm sure though that I'd like to try one