Thread resurrection... I recently built a 7RM with a 26" barrel and even with the long barrel length, that thing is LOUD. It's not loud to me at all because the shooter is apparently in the cone of silence behind that thing. LOL
People next to you however? Man do I get some looks if I'm at the range doing load development. . Blows stuff off of people benches, hat's flying off, etc... You'll have either side of you to yourself with a quickness if you're at public gun range.
To put it in perspective, I had the RSO send a couple off through my rig while I sat on the bench next him, to see why some people were getting their knickers in a knot about it. I forgot to put my glasses on and my left eye started involuntarily twitching for 5 seconds after his second shot blasted me right in the dome. It's concussive.
Now, I give the people next to me a heads up before I start sending.
However, it is HIGHLY effective with recoil and preventing the barrel from jumping around.
It turned my nasty 7RM into a toddler with recoil. It works.