90 rounds is still plenty to kill a lot of people with and a person could carry more then 7 to 9 magazines. But out of most of the mass shootings we've seen as of late, in only one of them would a more limited magazine size have made a difference possibly (Tucson shooter). In the Virginia Tech shooting, in the Aurora shooting, in the Adam Lanza shooting, the outcome would have been the same. That said, I am not strictly opposed to limiting magazines to ten rounds, but not convinced of it either. I think both sides can make good arguments on the magazine issue.In combat, I used to carry 7-9 mags, which contained 210-270 rounds. Why would any civilian ever need that? That is what I would carry with the full intention to kill someone who would fire back at me. If we limited mags to civilians to be 10 rounds only, that would only be 90 rounds. A huge difference. It's a lot easier to escape with a guy has to reload every few seconds. Most people are not pros at the quick reload.