The 300 Whisper will not be any more quiet than any other round unless it is loaded to subsonic velocity levels. This usually requires that 220-250gr .30 bullets be used. At subsonic velocity with the heavy projectile, the round would be suitable only for vermin, two legged or four. The name of the cartridge is based on the above loads in a supressed firearm. The hunting level loads use a 125gr Ballistic Tip, or similar projectile at velocities in excess of 2000fps, which will be nearly as loud as any other round in that class.