Also, you can't really compare pistol rounds to rifle rounds. Pistol rounds are designed to retain as much of the original mass as possible. Since the target is 12" of penetration, fragmentation would remove the mass necessary to achieve suchy.
Modern "combat" ammunition is designed to fragment, lest they zip in and out without significant damage. Fragmentation is the key for military small arms (after shot placment, of course).
You've managed to convince me that you don't have even the most basic clue as to what you are talking about. FMJ, aka Military Ball, is specifically designed to stay in one piece for maximum penetration. It is specifically designed not to fragment. Check out the mil-spec on it sometime. You couldn't possibly be more wrong.
The only modern combat ammunition that is designed to fragment is pre-fragmented rounds, and these are not in use in any army in the world. I don't know how in the world you are calling that crap "combat" ammunition. It is designed so that it will not penetrate the interior walls of your house and kill your kids instead of an intruder.
One of the hardest things to do with a high-velocity round is to get it to expand, while staying together. Rifle rounds, like pistol rounds, are SPECIFICALLY designed to retain as much mass as possible for as long as possible. Military Ball ammo does NOT fragment except for extreme conditions. The only exceptions to FMJ staying in one piece are extremely thin walled varmint rounds.
You don't know anything about rifles, pistols, or the ammo used in either. You sound like you are getting all of your vast amount of knowledge from Myth Busters or something.