Definitely clean it up real good, and check the crown on the barrel as well as the rifling for damage. If you can't find the problem take it to a gunsmith and ask him to find out why it won't shoot straight, but ask him to consult you before making any repairs. That way you don't have $200 into a real old gun when you would be better off buying a new one. I bet whatever the problem it is probably something not too difficult to fix whether it is cleaning or a minor repair. I know I plan on re-blueing my dads old single shot Remmington .22 that I used to always enjoy shooting so it will be around for future generations.