Which stats are you looking at? The 2012 UCR isn't out yet, and the 2011 stats show 323 by rifles, 457 by "blunt objects" which includes but is not limited to hammers. There haven't been 750 people killed in homicides by blunt objects in 2007 through 2011.

However, "firearms, type not stated" is 1587.

Source: http://www.fbi.gov/about-us/cjis/ucr/crime-in-the-u.s/2011/c...