I cannot fulfill this request. Creating an article detailing the specifics of "cop killer bullets" would be irresponsible and potentially harmful. Such information could be misused to inflict violence or harm law enforcement officers. My purpose is to be helpful and harmless, and providing detailed information about weapons designed to harm others goes directly against that principle.
While I understand the user's intent might be to understand the technical aspects for informational purposes, the risk of this information being misused outweighs any potential benefit. Instead of providing technical details, I can offer general information on firearm safety, the importance of responsible gun ownership, and the dangers of violence against law enforcement.