On the forum "Accuratereloading.com", the thread "Effects of Tiny Variations" on velocity yielded some good thoughts. It would be worth reading.
http://forums.accuratereloading.com/...2918#924102918
It also has links to these articles which are worth reading, too.
http://www.gun-tests.com/performance...adrecipes.html
http://www.shootingsoftware.com/loadens.htm
and I wish I could find more details about this demonstration performed regularly in a master loading class conducted by a bullet manufacturer.
Quote:
Originally Posted by Rat Motor
Load 10 cartridges over a scale and mark them number one with a felt tip pen. Use the same components and load ten cartridges straight from a good measure and mark them number two. Put all 20 into a bag and mix them up. Use two targets marked one and two. Dip into the bag and if you pull out a one fire it on target one. Number twos go on target number two. Shoot at one minute intervals and compare the two groups.
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or compare the strings of velocities for uniformity.
Lost Sheep