I have the Nill closed-back finger groove grips on my Mountain gun, and felt recoil is a lot less that it was with the factory rubber Hogues which were way to narrow for me. My hands are of average size and I find the Nills absolutely perfect for single-action shooting which comprises 99.999 percent of my shooting with that revolver. The ARE a little large for double-action shooting, but it is certainly doable.