I did some benchrest shooting and reloading. harmonics were effected by- barrel heat treat, barrel thickness,barrel contour, barrel length, barrel bedding pressure point, free floated barrel, where the gun was rested or griped, the hardness of what it was rested on, bullet weight, powder charge, powder burning speed-----and each factor affected the other --a huge number more variables. Too many factors for most the figure out. I refuse to worry about in when building a muzzleloader-i want to have fun.