Just read about the 7mm Rogue.
7mm Rogue » R Bros Rifles
It would appear to be pretty much the same as the 7mm/300 win with "some measurement relationships with todays “accuracy” cartridges" quote copied from article.
IMO the 7mm Mashburn/ 7mm-300 win mag 7 LRM and 7mm/375 Ruger are pretty much the same. Variations will be in the throating based on who requests the reamer specifications. Pick one and run with it with indistinguishable performance.