I have a vari-X III 4.5-14X50AO scope and the Leupold high mounts will not let the scope clear the barrel. I went to purchase the extra high mounts and the salesman told me that I would run into problems with the scope mounted that high. He stated that I may have problems if I were to shoot over 300yds. Can someone give me a little advice on this? Not saying that I shoot that far all the time, but if the condition and situation is right, I don't want to feel restricted on stretching it out. Any feedback is welcome!