Little Bullets but Big Impacts: The 0.17 HMR and 2 Homicide Cases

Area of Science:

• Forensic Pathology
• Ballistics
• Firearm Injury Research

Background:

• Firearms are a major cause of violent injury and death in the U.S.
• Most firearm incidents involve common handguns or rifles using center-fired cartridges.
• Small-caliber, rim-fired rounds like the .22 Long Rifle are less common in crime, but the .17 Hornady Magnum Rimfire (HMR) is a high-velocity variant with limited documentation in lethal outcomes.

Purpose of the Study:

• To document and analyze homicide cases involving the .17 Hornady Magnum Rimfire (HMR) cartridge.
• To contribute to the limited literature on injuries and fatalities caused by high-velocity, small-caliber bullets.
• To raise awareness of the potential lethality of the .17 HMR round in criminal contexts.

Main Methods:

• Case report analysis of two homicide incidents.
• Review of forensic evidence related to the .17 HMR caliber bullets.
• Examination of wound characteristics and ballistics data.

Main Results:

• Two fatalities were documented involving .17 HMR caliber bullets.
• The cases demonstrate the capacity of this high-velocity, small-caliber round to cause lethal injuries.
• Ballistic and wound data were consistent with high-velocity projectile trauma.

Conclusions:

• The .17 Hornady Magnum Rimfire (HMR) cartridge, though typically used for hunting, can be involved in lethal criminal violence.
• Further research is warranted to understand the full spectrum of injuries caused by .17 HMR projectiles.
• Forensic pathology and ballistics communities should be aware of the potential for .17 HMR involvement in violent crime.