Maybe this has been previously discussed, I haven't read all the below posts yet.

I'm looking at the Alliant website and comparing recipes for different RL26 loads for the 7 Rem Mag.

Take a look at the load for the Nosler 160 Partition for the 7 Rem Mag -- 65.9 grains for a velocity of 3051 fps.

Then compare the same load for the 7WSM -- 71.1 grains for a velocity of 3162 fps.

Could that be a typo?

http://www.alliantpowder.com/reloaders/Powder.aspx?powderid=40

Rem mag is loaded to lower chamber pressures

That's what it is....