Are you sure it's the scope that is the issue. Lots of times (more often than scopes losing zero in my experience) the RIFLE will change its point of impact over time due to stock changes because of changing moisture content. That's the main reason I free float barrels in hunting rifles.
I assume you also know that any change in the specific load you are using will require scope adjustment.
Before you throw it away, which is what I would do with a scope that doesn't work, make sure the scope is the real issue for you.