LOL.
<TABLE class=wikitable><TBODY><TR><TH>Chambering</TH><TD>7N21 9x19mm variant</TD><TD>7N31 9x19mm variant</TD></TR><TR><TD>Bullet weight</TD><TD>5.3 g (82 gr)</TD><TD>4.2 g (65 gr)</TD></TR><TR><TD>Muzzle velocity</TD><TD>460 m/s (1,509 ft/s)</TD><TD>600 m/s (1,969 ft/s)</TD></TR><TR><TD>Muzzle energy</TD><TD>561 J (414 ft.lbf)</TD><TD>756 J (558 ft.lbf)</TD></TR><TR><TD>Maximum pressure</TD><TD>280 MPa (40,611 psi)</TD><TD>
</TD></TR></TBODY></TABLE>
<TABLE style="TEXT-ALIGN: left; BORDER-SPACING: 2px; WIDTH: 315px; FONT-SIZE: 90%" class=infobox><TBODY><TR style="TEXT-ALIGN: center; BACKGROUND: rgb(222,222,222); FONT-SIZE: 90%; -moz-background-clip: border; -moz-background-origin: padding; -moz-background-inline-policy: continuous"><TH>Bullet weight/type</TH><TH>Velocity</TH><TH>Energy</TH></TR><TR style="TEXT-ALIGN: center; FONT-SIZE: 90%"><TD style="BORDER-BOTTOM: rgb(170,170,170) 1px dotted; VERTICAL-ALIGN: middle">165
gr (10.7
g) Federal Premium Low Recoil JHP</TD><TD style="BORDER-BOTTOM: rgb(170,170,170) 1px dotted">1,060 ft/s (320 m/s)</TD><TD style="BORDER-BOTTOM: rgb(170,170,170) 1px dotted">412
ft·lbf (559
J)</TD></TR><TR style="TEXT-ALIGN: center; FONT-SIZE: 90%"><TD style="BORDER-BOTTOM: rgb(170,170,170) 1px dotted; VERTICAL-ALIGN: middle">185
gr (12.0
g) Corbon DPX</TD><TD style="BORDER-BOTTOM: rgb(170,170,170) 1px dotted">1,075 ft/s (328 m/s)</TD><TD style="BORDER-BOTTOM: rgb(170,170,170) 1px dotted">475
ft·lbf (644
J)</TD></TR><TR style="TEXT-ALIGN: center; FONT-SIZE: 90%"><TD style="BORDER-BOTTOM: rgb(170,170,170) 1px dotted; VERTICAL-ALIGN: middle">200
gr (13
g) Speer Gold Dot JHP +P</TD><TD style="BORDER-BOTTOM: rgb(170,170,170) 1px dotted">1,080 ft/s (330 m/s)</TD><TD style="BORDER-BOTTOM: rgb(170,170,170) 1px dotted">518
ft·lbf (702
J)</TD></TR><TR style="TEXT-ALIGN: center; FONT-SIZE: 90%"><TD style="BORDER-BOTTOM: rgb(170,170,170) 1px dotted; VERTICAL-ALIGN: middle">230
gr (15
g) Speer Lawman FMJ</TD><TD style="BORDER-BOTTOM: rgb(170,170,170) 1px dotted">830 ft/s (250 m/s)</TD><TD style="BORDER-BOTTOM: rgb(170,170,170) 1px dotted">352
ft·lbf (477
J)</TD></TR><TR><TD style="TEXT-ALIGN: center; FONT-SIZE: 90%; PADDING-TOP: 5px" colSpan=3>
Test barrel length: 5 in
Source: Midway USA<SUP id=cite_ref-1 class=reference>[2]</SUP>
</TD></TR></TBODY></TABLE>
So...how does that pick a man off his feet, exactly? I've shot a 22 pound .50 caliber rifle and it didn't throw me off my feet, let alone a pistol caliber generating little more then 20 pounds of recoil. A 30-06 or a 12 gauge shotgun barely carry enough energy to drop a 9 year old. I doubt a pistol caliber has enough to lift a grown man off his feet.