Profire Arms & Supply has just developed a new line of subsonic .308 ammunition that has a dB signature somewhere between a normal conversation and the noise of a standard bus ride. It's been metered and authorized by the videos below. And that's just awesome.
This subsonic ammo is running between 65-69 dB. See the chart below. The videos below are actual sound meter testing of our 'Sub Thumper' ammo.
Test #1 <--Click Here
Test #2 <--Click Here
Test #3 <--Click Here