6" .44 AMP and 6.5" .44Mag
8" .44AMP
Just a couple of examples to remind everyone that all semi autos aren't "service class".
LAR Grizzly .45WinMag
Wildey .45 Win Mag
Desert Eagle .44 Mag
Here's a point I didn't see mentioned, probably because so few people ever experience it. The difference in the feel of the recoil between a revolver and a semi auto when shooting .44magnum class loads.
For me, the different shape of the semi auto grip (along with the weight of the guns) makes .44Mag level loads much more pleasant to shoot than any revolver, DA or SA.
I can run the same .44Mag ammo through a S&W M29, a Ruger SuperBlackhawk, A Desert Eagle, an LAR Grizzly and a T/C Contender. And even with pachmayr grips, the least pleasant to shoot at 1400fps+ is the S&W, and the Contender.
As to the "power band" needed by semis, but not revolvers, the Wildey has an adjustable gas system so it can run on about anything. Sure, you have to twist the nut on the barrel, which you don't have to do on a revolver, but its a small matter, really.
And, speaking of small matters, whether or not the slide & barrel move before the bullet leaves the barrel doesn't matter. And claiming it "robs" velocity from a semi auto round is simply a red herring. ALL that matter is the speed actually delivered. Not what it might have lost on its way down the barrel.
And why even mention that, without the counter argument about revolvers and the barrel/cylinder gap??? Again, what matters is not what is lost, or where, but what is actually delivered.
I like both revolvers and semi autos, especially some uncommon semi autos. Both have their advantages and disadvantages, all that really matters is you or I be happy with them for what they ARE, and are not.