forensics ballistics rifling marks on bullet also known as land impressions and groove impressions

9mm also ammo ammunition ancient armed army background ballistic ballistics brass bullet bullets caliber cartridge closeup copper crime criminal danger deadly detail dirty firearm forensics full groove gun handgun impressions kill known land lead macro marks memorabilia metal metallic military millimeter murder object old power projectile range reflection retro rifle rifling round rusty shell shiny shot shotgun surface vintage violence war weapon white wwii