Hornady's 2012 introduction of Critical Duty ammo has been met with applause from the law enforcement community. Critical Duty ammunition is designed to perform very well on the stringent FBI protocol tests making this ideally suited for law enforcement as well as personal defense situations.
The biggest thing that differentiates Critical Duty from Hornady's Critical Defense ammo is that Critical Duty ammo is designed to penetrate barriers such as sheet metal, wall board, plywood, heavy clothing, and auto glass as outlined in the FBI protocols. This barrier penetration need is more prevalent in the law enforcement community due to the different types of threats that LE professionals are likely to encounter.
This 40 Smith and Wesson ammo has performed very well in FBI tests maintaining great weight retention through all barriers helping it to achieve the required 12-18" of penetration into gelatin after passing through the established barriers. The FlexLock bullet incorporates Hornady's patented Flex Tip that initiates expansion while preventing clogging along with their Interlock band that prevents jacket/core separation. Jacket/Core separation is where most non-bonded JHP bullets fail in penetration tests because when the lead core and copper jacket separate from each other their lighter weights aren't able to achieve the needed penetration to bring down an assailant. The Interlock band prevents this occurrence.
Hornady's Critical Duty line of ammo is truly a 21st century duty ammunition!