Apples and oranges.andy said:too big a waste of time and money for me. Can get the same ballistics out of a 9mm, with the right bullet.
The SS190 is the 5.7x28 mm Ball round. Its projectile will perforate any individual protection on today's battlefield including the PASGT kevlar helmet, 48 layers of kevlar body armor and the CRISAT target (titanium and kevlar). The SS190's conventional design allows it to be manufactured on existing production lines, and its lead-free composition eliminates range contamination.
Here is a pic of what the 5.7 SS192 ammo will do to a level 2 vest followed by two phone books when fired from the FN Five seveN (note that this vest stopped a .44 magnum, .357 magnum, and .45acp):
The 5.7x28, from what I have heard, was designed for initial penetration of ballistic vests and light personel armor then incapacitation through tumbling action of the projectile. So which do you think would penetrate a ballistic vest better? A 9mm diameter projectile, or a 5.7mm one, at the same velocities?