No matter how good you are at the range when you're in a gun fight that all goes out the window unless you practice so much when your body goes into brain off mode your training takes over. Also all the practice at shooting at a target is worthless when firing at a moving target and police in this country do not do moving target practice unless you get to go to some fancy firearms course usually sponsored by a Federal Agency.

The FBI actually had reduced velocity 10mm rounds so I would imagine the outrageous cost of the ammo was part of the problem maybe the size of the gun too. My agency had custom loaded 40 S&W rounds by Federal and they were ultra high velocity to the point we had to have both H&K and baretta custom reinforce the pistols otherwise the frames were cracking.