Well, judging the FBI data based on wound volume for clothed and bare gelating
does support the conventional hierarchy: .45/10mm - .40 - 9mm.
The heaviest bullets in each caliber generally did do the best in the clothed gelatin tests, but were pretty close in some cases. In bare gelatin, this was not the case, as the 9mm 124+P beat the 147 Black Talon, for example.
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Of course, the ammo makers don't want to tell you that hardball or lead will do as well or better than their dollar apiece premium ammunition.
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No! This dogma is not reflective of reality.
It is totally wrong and not supported by the data. If we are judging based on wound volume, expansion is critical. Look at the best performers for that metric - they all expanded 50-60% in the clothed gelatin.
For example, take the best performer for wound volume in clothed gelatin, (45ACP Rem G.S. | 230 gr @ 871), it expanded to 0.73 and penetrated 18.85 inches, giving an approximate (as discussed before) wound volume of 7.89 cubic inches. If this round did not expand, and we assume it would not penetrate more (false - it would), the wound volume would be only about 3 cubic inches. Expansion is critical.
-z