There has always been debate about .45 v. 9mm. When I was istol shooting there were endless arguments at the Pistol Club about it.
The .45 ACP was designed at the beginning of last century, primarily to stop psycho enemies hyped up by whatever. Enemies like the Moro. This signaled the introduction of the new .45 ACP and a new pistol to use it the ubiquitous Colt 1911, a design so perfect that it is still in use today. Of course it was designed by John Browning. This guy was a phenomenon amongst weapon designers. He not only designed the Colt 1911 but he also developed the first gas-operated machine gun, the Colt-Browning Model 1895—a system that would surpass recoil operation in popularity, the Browning .50 caliber machine gun which is still use today in modern armies, the Browning Automatic Rifle, and a ground-breaking semi-automatic shotgun, the Browning Auto-5.
He also designed the Browning Hi-Power which was released by Fabrique Nationale the Belgian arms maker. The Browning High Power was built in 9mm. So John Browning’s firearms designs still endure. The man himself was a Mormon. The full list of his designs can be found on Wikipedia. Anyway the point is John browning designed weapons for both mainstream pistol calibres. Our own Police use Glock 9mm pistols. The 9mm Parabellum to use its correct designation is only a few years older than the .45ACP and was released in 1902.
“The 9mm is best. With modern loads it is potent and holds a lot of shots. I feel more secure with 15 shots than seven to nine in the larger caliber.” I do believe that today’s crop of 9mm defensive ammo is very good and very possibly we are seeing the best loads that can be had, not only in 9mm but in other calibers as well. The “best” part sort of messes things up for me. The 9mm may very well be potent (and I believe that it is), but does that prove “better” (than .45 ACP), which is almost always the question really being asked? The “feeling more secure” part is dependent upon the scenario envisioned by the user and personal preferences. IF one runs into the usual 3 or 4 shot deadly force scenario, but cannot “solve” the problem quickly against deadly opponents, he will possibly run out of time before ammunition. While some 9mm’s large magazine capacity might very well be useful in some situations, it doesn’t necessarily guarantee success across the board.”
I believe large magazine capacity develops a “spray and pray” mentality rather than marksmanship. Speaking of “spray and pray” firearms, there are none so maligned as sub-machine guns. Sub-machine guns are fully automatic firearms that generally fire pistol calibres like 9mm and .45ACP. The most famous .45 ACP Sub-Machine Gun is the Thompson, or “Tommy Gun”. The most famous 9mm SMG is probably the Heckler & Kock MP5 series for their accuracy and dependability. Close second would be the Israeli Uzi.
Except for now. Someone has innovated what was thought to be unable to be innovated. A better SMG than the MP5 and in .45 calibre. It is the Kriss.