I have had my Oehler for about a year now and have a couple questions for the Pro's. I am getting different velocitiess from the two screens on my Oehler. When I do a print out of my shot strings the left collum velocities do not come close to my right collum Velocities. The right collum numbers range from 20-40fps faster. My Oehler came with a 4ft piece of conduit with three dimples to attach everthing. I usually measure 12ft. from muzzle to the 1st screen. I am thinking my spacing maybe off a little or I need a longer bar to hold the screens. I do not think there is anything wrong with the unit...just the operator Suggestions Please. P.S. I am shooting a 338LM & 300WM with Muzzle Brakes.