Assume that you are measuring powder down to 1/10th of a granule, and that variation in bullet weight, neck tension, case capacity, etc. are giving you a standard deviation of 30 FPS. So you switch from measuring down to 1/10th of a granule to using my powder measure. Here are the actual numbers:
223/5.56, Varget. The standard deviation of 30 FPS becomes 31.95 FPS as previously shown.
223/5.56, ball powder. SD of the powder measure is .041 grains. The standard deviation of 30 FPS becomes 30.28 FPS.
308, Varget. The standard deviation of 30 FPS becomes 30.67 FPS.
308, ball powder. The standard deviation of 30 FPS becomes 30.04 FPS.
I've given you all the necessary steps, so you can make the same calculation for other cartridges if you like.
Just to simplify this for me, I’m assuming you’re saying that the things that are in bold and underlined in your post, will have a far greater effect on the velocity ES/SD than throwing charges through a powder measure will.
