I have noticed a big run on my 7SS lately and these are the common reasons that I hear.
When I run the numbers, I can't find anything else that compares that will run a 180 class bullet with 61 grains of powder in a 2.9" magazine at 3000 fps!
I really like the extra pop of the 7mm coupled with flat trajectory.
It really stacks up well with wind bucking ability coupled with amazing range before going transonic, and the list goes on.
Recently we added a slightly milder little brother with a shorter yet coal and offering smooth feeding in any short mag configuration. When I say slightly milder than the SS, it is still comparable in velocity to a standard saum only at sub 2.9" coal.
Last but not least, big brother Max which is at least the ballistic equivalent of the WSM only with far better design and case life. It will perform best at 3.1" which is what most of the short action competitors should be to perform at their best. The problem is, they still won't keep up with Max!
When you add quality head stamped Sherman (ADG) brass to the mix and reamers and dies in stock, you will be hard pressed to top the 3 Amigos pictured below with the Saum. The rounded shoulder on the Max doesn't really do the case justice. I had to improvise a hydro forming and the fired case will be squared up like the SS only farther forward of where it looks now. You get the idea.