Cayugad is right. Contrary to what a lot of folks would have you believe, variation of a couple of grains one way or the other will NOT effect the way a BP rifle groups, be it a ML or Schuetzen BP cartridge target rifle.There are some groups that were fired from a bench in the late 1800's withSchuetzen rifles that have not been beaten yet with anything like such a rifle.....and those old boys invariably used a volume measure for loading both their Schuetzens and their extreme-range slug rifles.

This however does NOT mean that you can get away with throwing charges inconsistently! I have a powder measure for smokeless that will throw charges within 1/2 grain, if I operate it with consistency-the same rule applies to a hand-held volume measure. I tap mine 5 times per charge, and my measure has a built-in cutoff plate.

The rounds fired for this group were thrown with this 120-grain MAX. volume measure set at 70 grains, so each charge required two throws... I doubt that it would have been better if the charges were weighed!