User OWENSWW
http://nfatalk.org/forum/showthread.php?t=11908&page=3
Edit:
AVG SOUND LEVEL (Advertised):
300 BLK – 119.5 dB
5.56 – 130.1 dB
308 – 133.9 dB
Waiting for the SiShop viedeo to see what hosts were used, I think a bolt gun was the .308 host in the SiCo promotional video and we are without official comment on what barrel length was used for .300blk. It looks like the Omega is pretty close to the Saker dB wise.
Saker Sound Reduction (From Manufacturer):
5.56 – 134 dB
.300 BLK Subsonic – 126 dB
.308 – 139 dB