I have a problem when I shoot at animals...significant crosshair movement with my heartbeat. I believe that my excitement with the event leads to a hyperdynamic heartbeat. Using a 4x scope at 100 yards, the crosshair movement is approximately the height of a deer chest. The movement is only vertical. This year, I have shot about 300 rounds at the range preparing for the season. When I practice at the range, I do not have this issue since I do not have the same excitement. At the range, I can consistently shoot 2 inch groups seated with a bipod. I have tried slowing my breathing, deep breathing, carotid massage, and valsalva maneuvers...without much help. My trigger pull is still good and smooth. Does anyone have any recommendations?