Well, first I should clarify that I mean some states have various limits on ammunition and magazine capacity, and that does not help those states with regard to homicide statistics.

Secondly, do you think that is unreasonable amount of ammunition? What kinds of legal limitations would you propose?

For reference, that's about enough ammo for one person for less than an hour of time at a gun range. Any responsible gun owner is going to be at the range with some regularity, and would go through at least that much in one day.