Here you go....Klecks on the topic.....
http://www.utdallas.edu/~tvk071000/Banning Large Capacity Magazines Will Not Reduce Crime.pdf
Whether a ban on large capacity magazines (LCM’s) could lead to a significant reduction in ordinary gun homicides hinges on the following question:
How many victims would not have been killed if the assailant was limited to a 10-shot magazine?
While medical and police data on this matter are hard to come by, the few studies that have examined the issue of shots fired during criminal attacks reveals the following:
1) criminals, on average, fire less than 4 rounds in a typical gun attack (irrespective of whether someone is killed or wounded);
2) only 8 percent of victims actually wounded in gun attacks suffered five or more entrance wounds;
3) in attacks leading to the victims death, semiautomatics had been fired 2.7 times on average, as compared to 2.1 times for revolvers.
In light of these findings, the idea that freezing the supply of LCM’s (as existing LCM’s would likely be grandfathered into the new ban) could produce a detectable drop in the rate of gun homicides seems unlikely at best – gun criminals rarely fire large numbers of rounds.
Nevertheless, supporters might still argue that banning LCM’s could save lives by reducing the number of persons killed and wounded in mass public shootings.
If there were nearby persons willing to tackle the shooter, limits on magazine capacity might limit how much death and injury a shooter could inflict with the initial magazine; the smaller the magazine, the fewer the victims shot before the killer was stopped by interveners. Even in these rare events, however, LCM’s are irrelevant to the number of victims shot.
For example, in the decade before the expired AW ban, in the entire U.S. there were 15 mass shooting incidents in which more than 6 victims were killed or more than 12 were killed or wounded.
Of the 15 cases, in 14 of them either the shooter possessed multiple guns, which made it unnecessary for him to reload once one gun was empty, or the shooter in fact reloaded.
Recent history also casts doubt on whether a ban on LCM’s would alter the number of persons killed and wounded in mass public shootings.
While one of the Columbine shooters used a 995 Hi-Point carbine rifle with a 10-round limit on magazine capacity (during the AW ban), he simply brought additional magazines to the attack—13 to be exact.
The Virginia Tech shooter had 17 magazines for his handguns and most were of the 10- round variety.
The Newtown shooter brought three guns to the school and fired at least two of them.
Simply put, these killers do not need LCM’s to fire many rounds without reloading – they simply bring plenty of magazines with them or drop one gun when its ammunition is exhausted and start firing another. Further, there are virtually no mass killings in which there is a bystander or victim willing to tackle the killer even if he does need to reload.
Loughner proceeded to fire apparently randomly at other members of the crowd.
[1][21]He reportedly used a
9×19mm Glock 19 semi-automatic pistol with a
33-round magazine.
[22][23] A nearby store employee said he heard "15 to 20 gunshots".
[24] Loughner stopped to reload, but dropped the loaded magazine from his pocket to the sidewalk, from where bystander Patricia Maisch grabbed it.
[25]Another bystander clubbed the back of the assailant's head with a folding chair, injuring his elbow in the process, representing the fourteenth injury.
[26] Loughner was tackled to the ground by Bill Badger, a 74-year-old retired
United States Army Colonel [27] who had been shot himself. Loughner was further subdued by Maisch and bystanders Roger Sulzgeber and Joseph Zamudio. Zamudio, a
concealed weapon (CCW) permit holder, had a weapon on his person, but arrived after the shooting had stopped and did not draw his firearm.
[28] Thirty-one shell casings were found at the scene by investigators.
[29]
