I think for the most part it's academic.........
In my opinion, in order for a realistic comparison to be made, the same gun/s should fire the same bullets into the same medium, from the same distance, with the point of impact being the same relative to the size of the medium.
The number of variables involved in the composition of a defensive shooting target, (ie a person with varying levels of clothing, and point of impact) and the lack of human test subjects, make accuracy of primary importance as opposed to performance data.
Yeah, I know about opinions, and this is just mine...
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USMC 8652, 2531, RVN Jun '67, - May 69
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