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Old September 19, 2010, 06:38 PM   #2
mykeal
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Join Date: October 8, 2006
Location: Northern Michigan
Posts: 2,772
Interesting, but I don't see the relevance of velocity standard deviation. I would think the ultimate discriminant on what projectile to use would be group size. Consistent muzzle velocity may be one factor which determines group size but it's only one of many, and a minor one in my opinion.

In addition, many people rely too much on the instrumentation without understanding it's role in the measurement process. How much of the standard deviation is due solely to the instrument - are you truly measuring variations in muzzle velocity or are the numbers simply reporting errors within the machine?

Chronograph data is given far too much credence, in my opinion. Where the ball hits should be the thing that tells us how the gun, powder and projectile are working together.
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