I'm getting ready to head out to Nebraska in a month for Mule Deer and went to the range a few times this past week an noticed that when zeroed at 100yrd, I'm getting a 7.5" drop on 200yrd shots. This seems like much more than I should expect given my research. The gun is a Remington 700 .308. I am shooting Federal Fusion Soft Point 150 Gr. There was no wind, elevation 750 and temp of 55 degrees. Scope height is 2". I am not a beginner when it comes to hunting, but have not had the need to really dial in a rifle for longer distances until now. Any input would be appreciated. I am curious if copper fouling could have anything to do with this. Thanks in advance!