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".

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.

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

What if you're writing a murder mystery novel?

or a filesystem...

I guess this refers to Reiser?