Biggfoot44 said:
9mm isn't "more better than everything else" as the FBI is spinning. As much as wiz bang bullet technology has improved 9mm performance, that technology can also be applied to .357Sig, .40S&W, .45acp, .38 Spl, etc.
While this is both a truthful and logical statement, it is a flawed sentiment which is based on misconception.
You see, 9mm JHP technology was improved out of necessity because back in the early days of Jacketed Hollowpoint ammunition being used in Law Enforcement, prior to the formation of the established FBI Specifications, ballistics performance was highly theoretical, and therefore JHPs weren't designed nor tested to confirm that they performed adequately because nobody had established a baseline for effectiveness. In fact, early on, the FBI was far more concerned with expansion than penetration, opting for bullets which expanded as much in diameter as possible, believing that the energy dump and larger wound diameter would be more incapacitating, right up until the infamous Miami-Dade FBI Shootout of 1986 when it was illustrated that deeper penetration was required for reliable incapacitation.
These facts are largely rejected by 9mm Luger advocates as it doesn't fit their narrative that 9mm Luger was always perfect and that there was never any legitimate need for the FBI to switch cartridges because the Miami Shootout was only such a huge disaster because the bad guys had rifles, and the underpenetration of the 9mm cartridge was only a scapegoat because apparently it would have made no difference if the bullet had reacted the heart.
Not to say that there was no fault in the FBI's tactics, but yeah, 9mm Luger did indeed fail to penetrate deeply enough in that instance, and the FBI was right to seek a new bullet.
Ironically, advocates of the 9mm Luger cartridge are also the first to point out the advancements in ballistics technology which they also claim were unnecessary, regardless of the fact that said advancements would have never occurred if the FBI hadn't moved away from the cartridge and formed the Testing Protocol which lead to the established FBI Specifications which were in turn used as the basis for modern 9mm JHP performance.
Anyway, as I was saying, the improvements in ballistics technology which made the 9mm JHP viable for duty aren't applicable to .40 S&W because .40 S&W was the basis for said performance to begin with, and is also less beneficial towards .45 ACP JHPs which already penetrated/expanded reliably, yet merely wasn't chosen as a replacement for .38 Special/9mm Luger in the past due to the lesser magazine capacity and poor barrier penetration. (At the time, the FBI was far more concerned about straight line barrier penetration since the perps in the Miami Shootout had used their car as cover which was believed to be a factor in the failure of JHPs.)
So no, the technology that made 9mm JHPs viable is by and large non-applicable towards other cartridges like .40 S&W, .357 SIG, and .45 ACP since those cartridges were either designed around FBI Specifications to begin with (.40 S&W / .357 SIG) or other never had any serious problems with reliable expansion or penetration to begin with.
If the improvements which were applied to 9mm JHP were applied to other catridges, then their performance would exceed FBI Specs, thus rendering them a failure being their "enhanced performance" would become a liability. There's a reason why the mighty 10mm Auto isn't a popular self-defense cartridge in full-power loads, and contrary to popular egocentric belief, it isn't because it's just so gosh-darn powerful that even trained LEOs can't handle the incredible recoil/blast that only the manliest of men can handle. It's because it overpenetrates, which can lead to collateral damage. (Yeah, yeah, I know... Not all 10mm loads overpenetrate, right? Well lemme guess, they aren't 200grs @ 1200fps, are they? Closer to maybe 180gr @ 1000fps or some 135gr @ 1700fps deal that can't overpenetrate because it fragments in soft tissue, right? Okay, good talk.)