Using a laser is never anything except a starting point. Especially if you have a powerful scope just getting close to zero can be a problem. I use a laser to get my scopes close and then use the traditional method to zero after that. I've never seen any scope that was truly zeroed from just using a bore laser. Distance, power of the particular bullet you're using, and other factors come into play. The "only" way to get a scope zeroed is to use the old fashioned method if you want to shoot accurate.