The Phantom Camera motion tracking feature allows us to measure how much the muzzle moves prior to bullet exit. In this case, the muzzle moves about 0.057" rearward during the time the bullet is moving down the barrel. This is a Remington 700 BDL in 30-06 firing 180 grain bullets. Many shooters talk about barrel harmonics and nodes. Watch carefully, there is no visible movement of the barrel in the vertical direction. First order dispersion effects are going to be driven more by variations of th