ipyrek: give it time friend, give it time. Old and well used are the looks favoured by many, but abused does not belong in the same statement line if ya want my opinion.
I s'pose that if ya want it to look used, then take it out and use it, a lot. I would handload for it, and hit the range with it as often as possible. Everytime I finish at the range I would clean it and oil up the stock a bit - nothing makes it look old, loved and used more than a old, well oiled stock. The more often, or longer that barrel heats up from shooting and direct sunlight the more it will seem the metal 'ages'. I have a Winchester AE Big Bore in 444 that I shoot a lot, oil the stock a lot and let it get good and hot at the range. I think she's 'gettin' there' .........jmtcw.