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Years ago I read about a project where a man took a .50 and necked it down to .30 caliber.
This is where the SLAP rounds come into play.
http://www.fas.org/man/dod-101/sys/land/slap.htm
We had a few cans of these during the initial Iraq invasion in 2003, but using API just made a lot more sense for the targets we came across, and it fed better anyway so the SLAP stayed in the can, unless we wanted something sharp to poke guys when they weren't looking.