The first thing I would check is to see if the barrel is floated. If it is not I would have it floated. Also I would check the bedding. Chances the wood (I'm assuming it is wood) has changed over the years and is affecting the barreled action as far as accuracy goes. The barrel could be severely...
If you want some nice case coloring, look up Tyler Gunworks. Bobby Tyler does some excellent work and is reasonably on top of that. Here's a couple he did for me