I went shooting with my old boss and we tried out the 44 Magnum. It was ridiculous. After your first shot, you would not be able to hear a damn thing if you didn't have the ear protection. Here's my boss trying it out:
Ah, yes: I've heard about this weird thing being practiced in HI. It was described differently to me though: the gun being attached by a piece of cable hanging from the ceiling. At least this is how it's alledgedly done in Maui's public ranges.
I have fired both the 44 Magnum in a revolver and a Henry Big Boy classic. This cartridge pairs very well with a long gun. I highly recommend the .45 ACP over a 44 Magnum when it comes to handguns but I would take the 44 Magnum over the .45 ACP in a carbine.
Ears? If your ears are bothering you, you may not have picked out the best hearing protection. Find foam ear plugs with a 33 db reduction rating. You can use those less effective muffs with the plugs and get an even better db reduction. If you can move to a NFA friendly state, a suppressor would help a lot with the ear safety.
Another safety tip, keep your hands away from the sides of the cylinder, Revolvers spray tons of burning gases out the side where the cylinder lines up with the barrel. You appear to be holding it correctly in the video so this comment is simply a reminder.
Let me know if the video doesn't play.