you'd think he'd have already posted all that peer reviewed data by Dr. Gary Roberts on the real world effectiveness of Underwood 357sig 65gr Xtreme Defender against Man, Kodiak and Polar bears, using service sized pistols.
So what's with the eternal erections around here for Dr Gary K Roberts?
I tend to not put much credence in dentists who claim to be ballistics experts, yet spout off scientifically-devoid opinions as if they are the ballistic Gospel... Kinda like he did with his nonsensical claims about the 357 Sig when compared to the 9mm.
QUOTE; "At best it offers no gain in bullet penetration and expansion characteristics. What is the point of this cartridge?"
This was the foundation for Lucky Gunner's infamous hit piece on the 357 Sig about 4 years ago. What I find particularly disturbing about Gary K Roberts (and how I discovered him in the first place) is that he authored a paper titled .... "Preliminary Evaluation of.357 Sig JHP Bullets Intended for Law Enforcement Duty" .... and erroneously determined that there was "no gain in bullet penetration and expansion" .
For anyone unaware, no gain in expansion would literally be impossible and speaks volumes about his flawed "scientific" methodologies. The statement is patently and unequivocally false. Much like the FBI.... Gary Roberts gives *FAR* too much credit to projectile penetration depth. It's arguably one of the most overly-hyped misconceptions pertaining to the lethality of fatal gunshot wounds in an ER setting.
During temporary cavitation (which occurs at distances in closer proximity to the intitial deposition of kinetic energy vs the elongated path of kinetic energy loss within the permanent cavity), high velocity-induced mechanical stress pressure waves are generated. As vonSee et al, 2009 and others have demonstrated, high-velocity projectiles create larger temporary cavitation than those of low-velocity projectiles and they [inherently] impart additional tissue damage as a result of these shock wave dynamics.
High velocity-induced pressure waves result in shearing strains and compression of the surrounding tissues called the extravasation zone. This primarily consists of torn capillaries/blood vessels which then efflux plasma, blood, ect. into the surrounding area, thus resulting in additional necrotic tissue loss and hemorrhaging. As evidenced in peer-reviewed research and clinical practice, mortality from gunshot wounds is more often related to vascular injury and shock than blunt trauma. In addition, the vacuum created by high-velocity projectiles during the expansion of the cavity causes suction of any foreign matter, debris and bacteria into the wound.
All of this aside, common sense [should] make it blatantly obvious that if you take two equally-weighted projectiles and mount one on a larger diameter casing (the 357 Sig is .381" to the 9mm's .355"), add on an additional 2,000-5,000 psi greater cartridge pressure and shoot
both projectiles from the same handgun at the same distance, at the same trajectory.... you can ONLY have one outcome; i.e. The one with the greater cartridge pressure deposits the greatest degree of kinetic energy.
The greater the kinetic energy = The greater the degree of kinetic transfer to tissue = The greater degree of temporary/permanent tissue displacement and hemorrhaging ~
. Oh dang .... I never published a peer-reviewed article, so I must be a "shill" who "made that shit up".
