Are you looking to justify you carry enough ammo or magazines?
Or how many rounds fired is acceptable and still be classified as self defense?
Just wanting a bit more.... info to narrow down and make it more pertinent to what you are seeking.
As for how many rounds is the most... ???? Would this include police officers or only private citizens?
Quote:
Self-protection
Between 1987 and 1990, David McDowall found that guns were used in defense during a crime incident 64,615 times annually.[61] This equates to two times out of 1,000 incidents (0.2%) that occurred in this time frame.[61] For violent crimes (assault, robbery, and rape), guns were used 0.83% of the time in self-defense.[61] Of the times that guns were used in self-defense, 71% of the crimes were committed by strangers, with the rest of the incidents evenly divided between offenders that were acquaintances or persons well-known to the victim.[61] Of all incidents where a gun was used for self-defense, victims shot at the offender 28% of the time.[61] In 20% of the self-defense incidents, the guns were used by police officers.[61] During this same time period, 1987 and 1990, there were 46,319 gun homicides,[62] and the National Crime Victimization Survey estimates that 2,628,532 nonfatal crimes involving guns occurred.[61]
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http://en.wikipedia.org/wiki/Gun_vio..._United_States