actually, so far the brenneke black magic is the most powerful round I have found with 3014 ft-lbs at the muzzle.
http://www.brennekeusa.com/web/text/magnum12.html
the Brenneke tactical round is not as powerful it is basically a solid which offers tremendous penetration:
http://www.brennekeusa.com/web/pdf/S...esShortMag.pdf
however, I was looking to see if anyone made anything even hotter than these two rounds.