Have worked up loads on several 300 WSM rifles for friends. On one Win 70, we installed a Vais muzzle brake with great success. Noise was not raised too bad, and recoil dropped to 308 level. Very impressive and really helped my recoil sensitive friend.
I would only put a brake on it if you want to enjoy shooting it
I put an Ops Inc on my 300 WM and I love it. Additional noise is really only noticeable when I'm shooting at our range under the covered shooting area. In the field there's not much if any difference. Just don't be standing to the side of it when someone else is shooting it.
By the way, it now feels like I'm shooting my .308.