[tacticalogic]

If for instance magazines are limited to 10 rounds that should reduce the rate of aimed fire by maybe 50%. It is easy to shoot at least 5 rounds in the time it takes to change a magazine.

How long did Lanza's shooting spree last?

[buwaya]

We don’t seem to have the whole story yet, but I believe it was under 20 minutes.
He seems to have fired at least 100 rounds, and I think it may have been more.
What the rate of fire was in any given period was, or what opportunity the victims had to escape, etc. are still unknown.

[Scoutmaster]

I’ve heard several reports - and seen a timeline - setting the time from Lanza’s entry to suicide as ten minutes.