I learned something new while out at SHOT 2012. I was speaking with John Williams III from US Optics (they make some of the best scopes out there by the way) about making some rather long range shots. He built up two scopes for me that would have enough travel to keep the crosshairs on target without the need to hold-over at 2500+yds. The scope bodies he made were a tad wider than ones he has done in the past in order to accommodate the extra travel required. John asked me if I had windage adjustable scope bases. I informed him that I did not and asked why they hell you would want windage adjustable scope bases in the 1st place? John explained that if the scope is not aligned straight you will have to use the windage adjustments to compensate. If it’s way out of kilter the erector tube in the scope could be 1/3 off center left or right. Since the erector tube is a circle within a circle when you start to dial on elevation to make those long distance shots the tube will contact the scope body much earlier than if it were centered due to its contact on the side of the scope body. I made the sketch below to illustrate what he was talking about. I walked away with more knowledge and that made me happy. You will soon see my USO adjustable scope bases on my 2000+yd rifles. Thanks John!