Gentlemen,
With a Leupold scope, if you crank the eyepiece out, it will slightly increase the magnification. If you crank it in, it will decrease the magnification. Of course there is a limit to how much a person will be able to crank one way or the other, as the eyepiece adjustment is actually there to adjust the sharpness of the reticle for individuals' eyesight.
243 fan, for a revolver, I prefer the 2X or 4X Leupold.