That's a fine rifle. You may try to remove any loose soft debris from the cartouches with a wooden toothpick.
The Swedes used Raw linseed oilicon. A mix of 50/50 RLO and Turps will make a good cleaning solution.
There's no picture of the bumps but I believe I know what your talking about. If I'm right it's the end grain raising. I see it on stocks and old furniture and then only in old growth Walnut,,,strange. The only way to remove that is sandpaper of 220 grit to 320 or scraper and that isn't recommended. All steel wool or higher grits will do is burnish "polish" the bumps. If you do decide to do anything be warned that no matter what that area will stick out like a sore thumb.
In short, clean it, leave it, enjoy it.