peetzakilla
I've tried in the 47 bazillion other threads about "carry capacity", "back up guns", spare mags" or however else they're worded.
No body has produced a civilian incident that didn't involve home or business (where such things as "carry capacity" are pointless since you can very well have your entire arsenal at your disposal with no inconvenience at all) in which reloads, or back up guns or high capacity saved the life, or the lack thereof cost the life, of the defender.
In Paul Kirchner's book
The Deadliest Men he writes in chaper 40 about Lance Thomas. He was born in 1940 and started his own business in 1974 in Los Angeles. The business was antiques clocks and classic watches.
In the first shooting incident was Aug. 1989 Thomas used a 5 shot S&W model 36 against a man who was pointing a 9mm at him demanding the watches. Thomas fires three shots the first hitting the bad guy under the nose the rest missed as he fell to the floor.
Thomas felt under gunned after that incident so purchased three .357 magnum revolvers. He screwed holsters at regular intervals behind the counter to hold the guns.
The second incident was Nov. 1989, involved 5 assailants. Initially two perps entered the store and one grabbed a customer and held a .25acp to her head, the other had a MAC-10 9mm who said" Give it up or we'll kill you." Thomas grabbed one of the .357s and shouted "Hit the deck." The one with the .25 fired eight rounds at Thomas, hitting him three times. Thomas was firing too. He fired 6 shots at the guy with the .25 hitting him 5 times missing once. He tossed the empty gun and grabbed his .38 with which he fired at one of the perps standing outside the door.
The perp with the MAC 10 fired bursts at Thomas as he called 911. Shots can be heard on the tape. Thomas picked up another .357 and emptied it into the perp with the MAC-10 killing him.
After a week in the hospital, he was interviewed by a FBI agent who suggested he switch to semi-autos for the greater ammo capacity. Thomas bought three SIG model 220 in .45acp and one SIG model 225 in 9mm. The FBI agent took Thomas to the shooting range and coached him in the modern pistol technique.
The third incident was Dec. 1991. A 6' 5" 250 pound man with a female accomplice entered the store. The guy handed Thomas a broken watch and as Thomas inspected the watch the man vaulted the counter and pressed a 9mm Glock to his neck. Thomas jerked his head to the side and grabbed a SIG. The man shot Thomas through the neck and hesitated. Thomas fired three 9mm rounds into the man's chest then the SIG jammed. As the man reeled backwards he fired twice more before Thomas grabbed a .45 and stitched him from his knee to his head with 5 shots. Thomas went to the hospital got a band aid and was back at work the next day. The perp died the accomplice fled.
The fourth incident was Feb. 1992. Two teenagers (19 and 17) were buzzed through the door. Thomas became suspicious of their nervousness and surreptitiously pulled a .45 from its holster. One the perps shouted "Your dead!" both teens pulled semiautomatics. The shout gave Thomas time to save his life. Thomas was missed by a bullet and he put most of a magazine into that shooter. The other teen perp was using the door as a shield and firing at Thomas. Thomas grabbed another .45 and fired 4 rounds into that shooter. Both perps died.
He is an example of a private citizen who needed more than the ammo load in one firearm to survive on more than one occasion. He also had a firearm jam on him.
I recommend Paul Kirchner's book as good reading. I just ordered his second book titled
MORE OF THE DEADLIEST MEN WHO EVER LIVED .
That's like asking if you really need 4 tires on your F-150.