9mm or .45 for self defense?
Ever since the Thompson-LaGarde ammuntion tests in 1904 at the Chicago stockyards, the stopping effects of the .45acp have become over exaggerated.
The Army tested the .45 vs. the 9mm using FMJ round nose ammo, so naturally, the bigger bullet had more effect when shooting the cattle.......the Army went with the bigger bullet due to their testing, and rightly so. The 1911 .45acp is still a very viable self defense gun and round.
However, the modern 9mm guns with good JHP self defense loads are also very viable for self defense. As mentioned in a previous post, shoot the gun and ammo that you shoot best. A 1911 .45 with eight round mags will hold 9 rounds in the gun if carried cocked and locked. The chances of needing more than 9 rounds in a gunfight are very remote. If a person is faced with an unruly mob, it may be best to seek cover....and if you are forced to fire a shot, most will run from the gunshots like cockroaches scattering from a bright light...... Criminals want to find easy prey.....they do not want to get in a gunfight over an attempted robbery. Psychopaths and terrorists are a different story, but the chances of ever facing this are even slimmer.
If you decide to use a 1911 9mm, it is still a viable self defense round with good JHP self defense loads. A 1911 9mm can hold 11 rounds in the gun when carried cocked and locked using 10 round mags. 9mm ammo is one of the cheapest pistol rounds to purchase at retail, and is one of the cheapest rounds to make if you reload your own ammo. You can purchase more ammo for less cost, so you can get more trigger time. Most people find the 1911 9mm easier to control when shooting fast follow up shots....
If you already own a .45 and you shoot it well, there is no reason to change. However, if you want a less expensive solution to train and get more trigger time, a 1911 9mm is a good option.....a man can't have too many 1911 guns!