cops kill a man threatening to kill...himself...wait what?

[Demi-fiend]

https://en.wikipedia.org/wiki/Superposed_load

"Superposed loads are loads that are placed in the barrel, one on top of the other, so that there is an alternating sequence of (from the breach end) powder, ball, powder, ball, etc., for the desired number of charges."

http://www.militaryimages.net/photopost/heavy-machine-guns/p55506-the-puckle-gun.html

http://firearmshistory.blogspot.com/2010/06/revolvers-pepper-box-revolver.html

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Not that I would ever actually need any of these...