User blog comment:Brothertim/Why does IW not use bullet drop over long ranges, or have delay?/@comment-1079585-20100129155151

Call of Duty uses hitscans which travel at infinite velocities in perfectly straight lines until they hit the end of the map or lose all of their damage/health during wall penetration. And shotguns' hitscans just disappear after a certain distance, depending on the shotgun. The only times I can think of when there have actually been bullets in a Call of Duty game are when you snipe Zakhaev in One Shot One Kill and when you are using the Barrett with Thermal in one of the Washington D.C. levels of MW2.