http://en.wikipedia.org/wiki/.300_Whisper
I don’t know how much of this you can see without logging in. Gun Tests is a great magazine though. There is zero advertising, just facts.
http://www.gun-tests.com/issues/23_11/features/Carbine-Rifle-Comparison5912-1.html
Here’s the outfit that invented the 300 Whisper.
http://sskindustries.com/