Several(many?), years ago, some of the currently in-vogue revolver experts made the argument that in case of a double-action revolver, the target grips (largest at the bottom, small at the top), were just the logical opposite of what double-action grips should be. They reasoned that the recoil forces are pushing the grips down into the hand, and the grips should actually be small at the bottom and larger at the top.
I experimented with a pair of wooden grips in the late seventies by working them down into the suggested ideal shape and what they had suggested seem to work very well. Then, a few years later, Hogue rubber mono-grips were produced that were of that design and I now have them on all my double-action revolvers. Inasmuch as I shoot my double-actions exclusively in the double-action mode, I find them to be very practical.