We didn't "switch" from the 7mm RM to .300 WM. I did make a leap, however: The .300 Winchester is capable of higher velocity than the 7mm Remington with the same bullet weights, primarily due to the larger bore, but also due to having a little ore powder capacity.
I was pointing out that even though Hodgdon lists a lot of powders for 180-grain loads in their data, none of them get the muzzle velocity Speer claimed for 175s (3070 fps) from the 7mm RM in one of their older manuals. This is another indication that Speer was NOT actually pressure-testing their loads for a long time.
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