Is your flier always after your 3rd or 4th shot? I heard John Krieger (of Krieger barrels) explain this phenomenon, and he knows barrels. The big magnum barrels heat up pretty quick, some after the 3rd shot. In the right outdoor temperature environment this will cause a mirage effect down your sight-line. Add the magnification of a scope into the mix and the mirage effect is magnified. With the target dancing around in the mirage where do you decide to shoot at it, when it's wiggled to the left or up or down. Just another possibility from an expert on building quality barrels.