I'm not convinced that longer bbls are "more accurate".
When I shoot, the front sight of my snub is ~ 28 inches from my dominant eye. The front sight of my 4" is 2 1/8 inches farther. A 6" bbl would be 2 inches farther than that etc. The rear sights are not in focus in any guns I shoot, as it should be.
Shooting, for me at least, is an extension of my arm. I point the arm and everything attached to it, fingers, gun, sights, all go the same direction of wherever I'm pointing. Corrections, to bring the sights on target, don't come from bending the wrist to manipulate the rear to front sight alignment. Corrections come from moving my ENTIRE arm, from the shoulder or even further back, my entire upper body, abs, pelvis etc.
Even if bbl length WERE a factor in accuracy, because the shooter didn't use his entire "pointing arm" as I do, it wouldn't be a factor in any realistic self defense scenario. You're not shooting quarter sized dots at 50 yards. You're shooting man sized torsos at 3-4-5 yards. And you're probably not doing much aiming with the sights at all.
I am really good with a revolver. I'm not EXTRA really good with a longer revolver. 1 7/8 to 8 3/8, my bullets go where I point. In fact, the longer, heavier guns create a little bit BIGGER wobble zone and for that reason might even be LESS accurate at long, single action, non-rapid fire distances.
Sgt Lumpy