I concur on the 500 grips. They look big, but are surprisingly comfortable and do an excellent job of reducing/eliminating recoil. I had a 396 Mountain Lite in .44 Special with a stock open backstrap grip that was virtually unshootable. The 500 grip made it as comfortable as possible. I currently have 500s on my Thunder Ranch 325 which make the 31oz .45 ACP feel like a little .38. Get the 500 grips and you'll be very satisfied. I would put the 500 grip on a Governor or any N-frame without a second thought.

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