With a premium barrel, it should have been hand lapped and smooth already. With a factory barrel, having soft copper jacketed bullets run down a much harder chromemoly or SS barrel simply isn' t going to wear the rough spots down enough in 5 or 50 shots to make a difference. Keeping the barrel clean at least will give you better accuracy though. Running a cleaning rod down your barrel every 5 shots, if done incorrectly will also hasten the barrel' s demise.