The only time this happened to me I had to scrape the finish and a layer of wood off to get down to bare wood. Easiest way to get it off without changing all the lines completely was to use a cabinet scraper and scrape a very thin layer off at a time until the blotchiness was gone. Took a while and had to reshape parts of the stock to accomodate the changes but it came out okay in the end. You can them put a layer or two of shellac on the wood to seal, then cover with a toned lacquer or polyurethane for the color you want...
For next time, of course... after you've lived with this one for dove season and learn to hate it every time you take it out.....
