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> Jared you wrote:
> "Centering on the
> target is something else again, group sizes are measured across the
> group--not to the center of the target. The group is often not in the center
> of the target, that's something esle again."
>
> Frank replied:
> So the tightness of the group is one measure of success and closeness to the
> target center is another? Is that what you're saying? And when you spoke of
> that half-minute of arc accuracy was that for clustering only or for closeness
> to the center?

Would this be the classic example of precision vs. accuracy, touched on in
an earlier thread? A random pattern of shots placed around the perimeter and
and center of the bulls eye would be accurate.  A very tight pattern,
although not near the bulls eyes would be precise (repeatability).  A tight
pattern in the center of the bulls eye would be both precise and accurate.

Bill

   

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