Quote Originally Posted by yobuck View Post
i dont think a half gr of powder varieation means anything as for group size especially with the slower burning ones. does the ladder test not confirm that?
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I don't think that is fully so yobuck. The ladder test will identify the charge which provides an accuracy "node" based on the bullet leaving the barrel when it is at it's extreme position in the vibration cycle, and therefore moving the least; so the bullet exits at the most stable point- this is related to the optimum barrel time. However the velocity is still a direct function of the amount of powder so any changes in the charge will still result in a variable amount of drop downrange; in other words you may launch the bullet in a more consistent position but it's fall will still not be identical across a velocity range.