The S curve grip on Deluxe Low and High Wall Winchesters is one of the more difficult to correctly render in the third dimension. I recently shaped one and shot a series of pics that might help if you were so inclined. This is not an exact duplicate, I have an original pistol grip stock. My ebony wedge is a bit larger but otherwise this is pretty close to the original.
Profile shaped in S curve with ebony wedge installed.
Rasping first side to rounded contour with layout lines on center-flat and side.
One side rasped, bottom view with layout lines
Rasping second side to rounded contour.
You will note that there is a small sliver of almost sap wood at the very edge of the grip, this all but disappeared in shaping and what it left will be stained to match the background color of the very fancy California English walnut stock.
