You cannot shoot out a .22 LR barrel. You could shoot a 1000rnds a day for 50 years and never hurt it. Now the way you clean it will have a dramatic effect on a LR barrel's life. The barrels on old .22 that look bad are not from shooting it but from lack of good care. Now as far as selling the stock and barrel, the barrel you'll have no problem selling. Go to rimfirecentral.com/forums. There are some that have the stock barrel cutback and rechambered to a Bentz chamber then recrown the barrel. They say it'll keep up with most any bull barrel.