I've been working up loads for my 270WSM the last couple of weeks with the Hodgdon Extreme powders for the same reasons you mentioned.
69grns of H1000 yielded 3065fps and .69in groups @ 100yds.
61.5grns of H4831SC yielded 2930fps and .86in groups @ 100yds.
The rifle has a 23in barrel and is...