9MM vs .40 S&W! Federal HST AMMO!
This guide details a ballistic gel test comparing 9mm and .40 S&W Federal HST ammunition, conducted by an experienced instructor. The test measures velocity, penetration, expansion, and weight retention using a chronograph and ballistic gel. Key takeaways highlight the superior energy and larger expanded diameter of the .40 S&W HST, while both calibers demonstrated excellent performance and weight retention.













