Not too long ago, I watched an online video in which the 9mm and 10mm Auto semi-automatic pistol rounds went head-to-head in a ballistic gel test to compare their effectiveness as bear defense loads.
More information: Brendan D. Shea et al, First satellite track of a juvenile shortfin mako shark (Isurus oxyrinchus) in the Mediterranean Sea, Frontiers in Marine Science (2024). DOI: 10.3389 ...