User blog comment:WanderingSkull/The Road Less Traveled: Doomguy vs. Master Chief/@comment-25221333-20140726154354/@comment-25221333-20140727132445

Could't find any info on Dooms shotgun so I assumed that becuase its set in the future, it would be on par with Chief's shotgun. Granted a single 9mm bullet would not have any effect on Chief, but hundreds of bullets hitting him every minute will definitely do something.