I am sure that any forensic evidence of any kind is verboten, but I'd bet dollars to doughnut holes that the bullet was at no such angle to his sternum.
Whether what whizzed by the two employees golfing at the 15th hole on Monday was definitely a bullet is one thing but there's no doubt a stray .223-caliber round had to be removed from Flores’ sternum.
M16/A2 shoots a 5.56mm/.223 cartridge:
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Describe the ranges for the M16/A2 Rifle.
* Maximum Range - 3,600 meters
* Max Effective Range for a Point Target - 550 meters
* Max Effective Range for an Area Target - 800 meters
http://www.armystudyguide.com/content/army_board_study_guide_topics/m16a2/m16a2-study-guide.shtml