Ballistic gel is one thing...and it tells a big tale. But go shoot some steel from 5-7 yards with a 5.7 and then shoot that same steel with a .40 or .45ACP. the difference is INCREDIBLE. And you'll never give the 5.7 a second thought....you'll stick the bigger rounds without a doubt.
Moving steel and other solid objects around has a lot to do with grain size. You would be remiss to assume that a rounds ability to damage tissue is positively correlated to its ability to move a steel target. Flesh is not steel.