[back_beyond]

Reputable gun shops offer ammunition whose primary selling point is its ability to kill humans. I mention this as a relevant aside: in the US, it is (very possibly) even legitimate to search something like "ammunition best suited to kill someone".

[Agathos]

And endless arguments about what caliber and kind of round has the best stopping power come up every day on gun forums. It's their vim vs. emacs.

[protomyth]

Yep, but I do believe this script does some searches for info on terrorists, and that would be problematic with the search you describe.