I have 4.62" SuperBlackhawk that I changed the grips on. The OEM grips were on the small side and the revolver was borderline uncomfortable to fire with proper .44 Mag loads.
Someone, I forget who, told me about a company called Texas Grips, a pair of their extended grips changed the whole nature of shooting this revolver. The grips are a little bigger and my pinky ain't hanging off the end of the grip.