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I no longer worry about S.D. for loading - Why?
A buddy was shooting his PPC, and he decided to find the best SD load... He worked up slowly, found a load that had little standard deviation, etc.
That load wouldn't shoot worth a darn. Lots of vertical dispersion. A little more wrenching on the powder measure, and he was there... Not optimal as far as SD was concerned, but hey...
A chrony will tell you what's going on, but don't build your load around one... Shoot what's accurate, not what looks good in theory.
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