I have a 7-mag T3X with no brake and it's not brutal as it is. Limbsaver #10826 takes the edge out of the Magnum versions. It still comes up and back, but there's a lot of squish to the pad.
7-mag has a COAL of 3.290", but the mag will let you go up to 3.340", maybe a hair more. If your load works well at that length you're in business.
The WSM version is pretty limiting too, but I found it feeds fine out of a regular Magnum magazine and you can replace the bolt stop with a long action bolt stop. At that point you are only limited by the throat.