If you have a scope with enough adjustment, or an angled mount, or if you shim enough under the rear of the scope, you can sight it in at 25 yards. Then, you'll be 4" or something high at 50 or 75 yards. And you'll still be low at 15 yards.
If everything you have now is correct and straight, you should be able to sight in at some distance. 50 or 75 yards might be easier to achieve than 25.