There has been much discussion about 9mm vs .380 with most saying that the .380 should not be carried. The October, 2015 issue of the "American Rifleman" has published some tests the staff did using new Sig ammo. Standard 10% Ordinance gelatin was used with two layers of denim, distance 25 yards.(except for the Diamond Back .380, 2.8 inch barrel 15 yards). The 90 grain .380 round penetrated the tow layers of denim and 10 inches of gel with a final diameter of .54 inch. The 9mm round fired from a Browning Hi Power, (25 yards) penetrated 14 inches with a final diameter of .56. inches Of course muzzle energy at 10 feet was twice as much in the 9mm over the .380. However, 10 inches penetration at 15 yards from a 2.8 inch barrel .380 isn't all that bad. It also is a reasonable distance one would expect to use it. The Glock model 42 with a 3.25 inch barrel would probably have slightly more velocity. Yes, this is all lab testing and theory but I feel comfortable with my Glock 42. It has slightly more power than a .22 short which seem to be the opinion of some.