In my experience, Magnum's enough slower-burning that the .270 Winchester tends to run out of powder room before similar results can be obtained, even though Magnum's a spherical powder.
A spherical powder halfway between Hunter and Magnum in burn-rate might be perfect for 150's in the .270, but the people at Western are having enough problems getting the Belgians to make enough Ramshot powder already!
Plus, the primary reason for RL-26 wasn't to come up with a perfect powder for 150-grain bullets in the .270 Winchester. Instead it was supposed to be a more temperature resistant powder than 22 or 25, and just happens to work really well with 150's in the .270. But a look at the other published data for RL-26 doesn't show any startling velocity increases in other applications, except perhaps the .243 Winchester with 100+ grain bullets.
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