Guns & Ammo has a video of Eric Poole shooting McMillan CS5 Sniper Rifle. The video is filmed with iPhone 4S and is shakey, but you can hear how quiet is with a designer ammo.
The action is names ALIAS and McMillan is planning to release a line of ALIAS rifles.
ALIAS CS5: 12.5-inch barrel
ALIAS STAR: 18 to 24-inch barrel
ALIAS T2K: 24 to 30-inch barrel
From: Guns & Ammo