RE: Muzzle Breaks ???'s
If you're concerned about your shoulder why not consider a Past recoil pad. I've got the Magnum version and wear it every time I go to the range. It works great. I could shoot my .300 Weatherby all day long and not have any problems as long I'm wearing the Past pad. It would cost a lot less than a muzzle brake.
I've neverhad a muzzle break on any of my rifles, so I can't comment on them other than to echo bigbullsby sayingthat I also hateshooting next to them at the range.