Careful stephen426 - you are right that the .45ACP slug has more momentum than the 9mm slug, however, it also has a larger diameter, and so incurs higher drag (resistance) when passing through the medium (flesh).
If you look at some penetration results for 9mm, .40S&W, .45ACP all of the same design and by the same manufacturer, they will have approximately equal penetration. The increase in mass (147gr/180gr/230gr) when going up in bullet diameter is just compensating for the increasing drag. To first order, these are equivalent in penetration.
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