Just read "We Need To Talk About Kevin" and found out to my surprise that the kid used a crossbow in his "school shooting" and not a gun. Is that realistic or just artistic licence on Shriver's part? How powerful would a crossbow need to be (draw weight/feet-per-second(fps)) to be lethal at, say, 10-20 yards? I've read that "broadheads" to tip the bolts with would increase the damage any shot would deliver, but the lack of any crossbow-related murders in the news, ever, is leading me to believe they're no good for naughty purposes. I've had a dead book project sitting as a pile of notes in paper and on my computer for a couple of years which could benefit from this info. Being British I can't easily write guns into my UK-set books (we have the toughest guns laws on Earth) so this would be very handy for my story!