One key element you are missing is the MV.
You will find that accuracy nodes also match up normally with MV nodes. That is the confirming factor.
you can shoot a ladder and at same time record the MV of each bullet. You will find that the bullets will make large jumps in MV (example say 25 fps) and then tend to tighten to maybe 8 fps when you hit a node and then open up back to 25 again as you go away from the node. You can normally find at least 2 nodes and that is also why MV is needed as one will be lower than the other and most hunters want the faster node.
(hint use colored magic markers on the tips of the bullets as it leaves the same colored ring on the target that is easy to discern each impact)
You need to shoot at a time of minimal wind such as early morning or late evening and 400 meters plus is great. You do not want to have bullets stacking on top of each other and unable to discern the jumps in elevation.
