curiosity again!

Hi John Alexander.  You are correct in that powder measurement and powder weighing statement.   You know John that some of those measurers throw some very accurate weights.  Take the Belding & Mall for an example. I have a few of them. With fine kernel, ball, or flake powders they can thrown pretty consistent "0" charges. In fact with the larger stick powder they can amaze you. I use to weight my charges in my very early beginning of reloading. I don't anymore.  So what does a consistent powder charge do? It gives consistent velocities which gives low SD's.  Now that's if everything else is in order. Bullet weights, diameters, case volumes, neck tensions, crimp if you use one, primers, condition of the bore, just to name a few. You can get very good accuracy without getting lower SD's. The difference between it and accuracy with low SD's (and throw ES's in there too!) is that with the higher SD's, meaning more variation in velocities, you'll have the higher velocity bullets and lower velocity bullets printing holes in different positions in the group. That's obivious to see and understand. Where as in the lower SD accurate group you'll see the bullets hitting near the same position, often into nearly the same hole.  Lowering your SD has a slightly bigger improvement the further the target is out there.  The think is there is only 1% improvement in hit percentage going from a SD of 10 fps to a SD of 3 fps!  If you are missing the target for reasons unrelated to vertical dispersion, then reducing vertical dispersion won't improve hit percentage very much.  This is primarily because of most misses at long range are caused by wind not vertical dispersion.