When you pick up your rifle you are going to need to get something to remove the cosmoline off with.
Warning do not shoot the rifle without removing the cosmoline first. I know it is tempting to. I have seen people that did not know any better do this at the range, and locked the action up tight. It did open with a lot of force after the rifle cooled off a whole lot.
Remove the action from the stock, and disassemble the bolt, and place all the small parts in a tub. Hold the barrel over the tub, and spray the living daylights out of it with either carb cleaner, or brake parts cleaner. Afterwards wipe them parts, and run a couple of patches down the bore. Then oil everything real well.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.