I run a Gunwerks 8ight on my 6x47 coyote rifle shooting 80gr Bergers, and love it. Have shot several doubles with it, and on New Years day I got one at 600 yards after missing the first shot (trying a head shot while he was in a ditch) he popped out of the ditch and had no idea what just happened. He dropped the second shot.
I love my Omega--for everything from .223 up to my 280ai. The one time I put it on a 204, there was just too much free space. Quieter than without the can, but far louder than any other round I have put through it.