There's a good bit of pressure-tested .270 Win/Magpro data in the Western Powders online manual.
Western Powders version 8Looks like it offers velocities on par with the old standby, H4831 - maybe a touch better.
I have a lot of Magpro but have not tried it myself in the .270 Win.
Please post your results, if you try it.
Cheers,
Rex