magazine size would have saved more children though, especially one particular 9-year old girl in arizona shot during the Giffords attack, and the 11 kids who escaped when lanza reloaded at Newtown. but of course, if we had known we were trying to change the past with new laws then they are by nature doomed to fail since it's impossible to undo what has already been done when it comes to others' actions.
Additionally your assertion that his reloading of his weapon allowed children to escape is not accurate. There are assumptions that this MAY be the case, but no official word yet from the police. Additionally, even the sories that make this assertion state that it was eithter his weapopn jamming, or him making an ERROR while reloading that allowed them time. Changing the magazine on a firearm (barring error) is an action of at most a couple seconds and will not give anyone time for a meaningful action. With practice there are many people who can change magazines so rapidly you won't even notice them doing so. Lanza reloaded frequently leaving many partially full magazines behind.