"Not this BS again....The link is to a PARTIAL, bastardized version of a FBI analysis of the PA fight--this document was NOT authorized to be publicly released.
The x-rays depicted clearly show multiple expanded .40 caliber JHP's in the assailant's body--all which appear to have penetrated substantially deeper than the 1" number being erroneously claimed by some ignorant internet posters. The FBI document unequivocally states that the Gold Dots satisfied FBI terminal performance requirements (ie. 12-18" penetration with acceptable expansion) and that it is IMPOSSIBLE for .40 S&W JHP 180 gr ammunition to expand with 1" or less penetration in the human body. It also states that 5 of the 6 .40 JHP's recovered on autopsy were expanded (83% expansion rate). It concludes that: "The .40 S&W ammunition did not fail in this incident."
As the FBI document states:
quote:Also from Dr. Roberts on lightfighter.net
"There is plenty of inaccurate information regarding ballistics/terminal performance disseminated on web forums, even those which are dedicated as LE only.
"the .223/5.56 mm Hornady TAP polymer tip and OTM rounds generally have poor performance against intermediate barriers like vehicles and glass. The FBI test protocols emphasize barrier blind projectiles with no performance degradation from intermediate barriers. This is why we do NOT recommend loads like the 75/77 gr OTM's for use in environments were shots may potentially be made around vehicles or other intermediate barriers. If your potential engagements are likely to involve such situations, then you need to go to a barrier blind load like the superb 62 gr Federal bonded JSP Tactical (LE223T3) and the similarly performing 55 gr Federal bonded JSP load (LE223T1). The Swift 75 gr Scirocco bonded PT and 60 gr Nosler Partition JSP bullets are also good choices. The all copper Barnes TSX bullets can work reasonably well, although the expanded "petals" often shear off when penetrating glass intermediate barriers. FWIW, contrary to what many believe, 62 gr M855 FMJ is not very go od against glass. For military use, the M995 AP is the best choice for vehicles and glass. Again, none of the OTM bullets, even the heavy 75 - 100 gr loads like Mk262, offer acceptable performance through automobile windshield glass. Take a look at my NDIA briefing for more info on barrier blind projectiles: http://www.dtic.mil/ndia/2008Intl/Roberts.pdf