All right, here is my other video.
In this video, it is the same guy shooting, Hud33, with the same HK .223 rifle. We place his AAC 762SD (.308) can and his M4-2000 (.223) can on it.
Right click and save:
http://www.korgon.com/ryder/Guns/sup...t%20shoot3.wmv

We literally could not hear a difference between the two cans this time. and we only had about a 20 second delay for him to switch between the two quick detach cans and start shooting again. This is why the suppressor market is soo funky.
I'm sure that if we had the proper sound metering equipment there would have been a difference, but to our ears, it was not substantial *THIS TIME* But at the CO silencer shoot, it was a very noticeable difference.