Even though it is "only" a Cooey, use a light hand on the sandpaper - there are angular shapes, and metal fittings that mate with the stock wood. Aggressive sanding wipes out or rounds over much detail, and many times causes the metal to sit proud of the wood - butt plates, for example, or the top line of the fore arm where it meets the action and barrel. Let the stripper / varnish remover do most of the work - do it twice, if you want - try to avoid sanding if you can - sanding can only take off wood, can't put it back on.