9mm +P vs 10mm: Not Close At All?
This video provides a direct comparison between 9mm +P and 10mm Auto through various barrier tests, including lumber, sand, concrete, and steel. While 10mm consistently demonstrated superior penetration and energy, especially through steel, 9mm +P performed better than expected in some tests. Chronograph data confirmed 10mm's higher muzzle energy, but the comparison highlights the nuanced performance differences between these popular handgun calibers.









