Playing with seating depth

[grayfox]

I find my node MV first, then adjust seating depth by 0.010 increments to look for the best grouping. The reason is that once you find a node, the next thing is to find the correct timing for bullet exit from the muzzle, when the longitudinal wave is far from the muzzle tip. that way each bullet exits the muzzle at same MV and same initial trajectory. You adjust the timing of the bullet exiting by the coal adjustments. = tight group.