http://en.wikipedia.org/wiki/5.7x28mm scroll down....


SB193 Sub Sonic

The SB193 cartridge features a 3.6 g (55 grain) Sierra Game King FMJBT (Full Metal Jacket Boat Tail) projectile. The SB193's low muzzle velocity eliminates the distinctive "crack" created by supersonic rounds when used in conjunction with the P90 Gemtech sound suppressor. The SB193 suffers from greatly reduced penetration and range, but benefits from slightly lower recoil. The white colored bullet tip can identify SB193 subsonic ammunition. Its sale to civilians is restricted by FN

As Diametrical, has already stated...at sub-sonic speed that, .22 cal is marginal at best, with poor penetration /stopping power....aka .22lr/ 135ft. enrgy......lol

It's a no brainer....A .30 cal at sub-sonic speed has far better penetration/range than a .22 lr........
http://www.quarterbore.com/300whisper/index.html

With all that fancy education, you still dont have the smarts too admit that your wrong!!...............

__________________
Matt (SD,CA)

1984 300SD.. White/Chrome Bunts..Green

1997 2500 Dodge Ram 5.9 Cummins 12 Valve 36 PSI of Boost = 400+hp & 800+tQ .. ..Greenspeed

2004 Dodge Ram 2500 4x4 Quad Cab Cummins 5.9 H.O "596hp/1225tq" 6 spd. Man. Leather Heated seats/Loaded..Flame Red....GREENSPEED

Global warming...Doing my part, Smokin da hippies..

Fight the good fight!......