Hi...Im fairly new to shooting and i have a question about my .270 x-bolt mounted with a Bushnell Elite scope. I've only taken the gun on 4 range trips, and noticed today that i was shooting an inch higher without making any adjustments to the scope. The mounts have 4 screws each instead of the normal 2 and everything seems tight. I was still grouping, but just a little off where I had been. Is it common to have to make minor scope adjustments now and then (2 clicks)? I am a new to shooting so maybe I was doing something different today than i had been and its shooter caused? I've used the same ammo each time. Thanks.