Generally speaking, as you upgrade from 9mm to 40 to 10mm, you gain 100ft-lbs of energy assuming similar classes of ammo (light, standard, hot or target, self defense, police/military/hunting). This ammunition is equivalent to hot 40 and light 10mm. In terms of effectiveness, the current FBI protocols set the gold standard for the uniquely optimal intersection of barrier penetration, energy dump into tissue, and penetration levels that work through shoulders into torso while not overpenetrating and endangering innocents. This ammo is not FBI protocol rated by Federal, unlike their HST. However on YouTube gelatin tests it performs well in other calibers. 9mm is optimal in terms of the carry weight of ammo, speed of return to target, and manageability by all family members. Round selection is critical since only the top defensive rounds satisfy FBI protocols. 40 caliber (also called 10mm short) is the first brute force round. Before 9mm became stouter and before good hollow points, 40 solved the problem with heavier bullets and a bigger cartridge to hold extra powder. Unlike 10mm, more FBI agents could qualify on 40. 10mm is the superior solution because at the top energy levels few other rounds can compete but it can be downloaded to 40 levels. In a pinch Glock chambered for 10mm can shoot 40 without modifications, and regularly with a 40 conversion barrel. Where does 10mm Punch fit in? Hotter than most 40 defense rounds, lighter recoil than HST 10mm. Its always best to shoot the hottest caliber you can control well (does not jam due to weak recoil rise control). This ammo is highly water and moisture resistant (sealed primer) and excellent for 10mm self defense. Federal quality control is outstanding. Recommended.