The FBI studies ranked the 10mm in 180gr only slightly better than the 45ACP with a 230gr (sectional density).
Actually, the study said that if the 45 were to be adopted that they would be satisfied but recommended the 10mm because it was the best.
If you Google Martin Fackler and sectional density a lot should come up. The FBI reports are on the FBI FOIA page, unfortunately I don't have a link handy.
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