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As I said, if it makes you happy to trickle powder down to zero, go ahead. (That may sound a bit smart-aleck. It's not meant that way at all.)
But there are so many other differences from round to round that a variation in charge gets masked by the other differences. For example: brass isn't the same. It may be thicker on one side than the next case - and by different amounts than another one. Brass hardness varies. Primer pockets are different depths, diameters and/or roundness. Flashholes are different diameters and smoothness. Bullets are of differeing diameters and with different bearing lengths. Jackets may be of different alloys, thicknesses and temper. Same with their cores, plus add bubbles or incomplete core fills. Add different seating depths, bullet pull, crimp and even the changing amount of fouling with each shot to the list.
ALL of those things affect pressure and velocity. There are even more things in the gun that affect accuracy, and can change from shot to shot, too. Throw in the wind and weather while we're at it.
Heck, it's a wonder we get any two shots to land even close to each other, much less do it repeatedly!
Finally, let me throw in this zinger: just because the scale SAYS it's the same charge weight (zero), how do you know IT isn't a bit off either way?
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