Anyone know what type of ammo NYPD uses?
No idea about the ammo but they use NY triggers which have a harder pull.
This is from wiki:
New NYPD officers are allowed to select one of three 9mm service pistols: the SIG P226 DAO, Smith & Wesson Model 5946, and Glock 19. All are modified to a 12-pound (53 N) trigger pull.The 9mm explains all shots fired by the cops -- no stopping power like a 45 ACP or an 'in between round' like 40S&W, and the 9mm explains all the collateral damage to the civilians. As I bet the rent in NYC they have to use the 'humane' FMJ round which is notorious for 'through and through' shots -- they did hit the nutcase Johnson 10 times yet civilians got shot too. And IMHO a 12 pound trigger pull is insane. The Glock 19 factory standard is 5 1/2 pounds.
Even the Chi PD allows the cops to use the .45ACP and 40 S&W. Only rookies are restricted to a 9mm for the 1st eighteen months, then they can 'arm up'. And the CPD can use Hollow Points and factory std trigger pulls (I checked this all yesterday). Another diff is Chi Cops have to buy their own service weapon(s). But recently Glocks became verbotten. Some Chief had 'an incident' with his Glock and had them banned.