But I read on the internet that caliber doesn’t matter
Having been called every name in the book for arguing that kinetic energy matters, I suppose I should just leave it to the West Point professor of physics. Turns out pressure wave effects cause rapid incapacitation due to nerve trunk and brain injury above 500 fpe. Serious brain injury (concussion) is likely above 600 fpe.
Here’s the study he references. Quote:
Not all bullet impacts produce a pressure wave strong enough to cause neurological symptoms. The likelihood of a bullet impact remote from the brain leading to rapid incapacitation has been demonstrated to increase with the local pressure wave magnitude.