Jerry Miculek, with his Smith & Wesson Model 627 Performance Center V-Comp .45 ACP Revolver, put 8 rounds into a target in one second. He also put 8 rounds on 4 targets in 1.06 seconds. and...then...6 shots, reload the revolver, another 6 shots, all in 2.99 seconds. :-)
See http://www.youtube.com/watch?v=7DpCellB_UQ for a History Channel clip of these amazing feats!
Not that I am saying Mr. Miculek was on this SWAT team. :-)