Most accurate powder for 270 and 150 BTips?

The most accurate powder for YOUR rifle is the powder that is most accurate in YOUR rifle.
With that said I have always had great results in multiple 270 Win's with H4831 with 130 to 150s. The old school standard load has been 60 grs with 130s and 58 grs with 150s. Most load data does not go that high these days but the 130 gr load used to be printed right on the bottle and the data for 150s was in Hodgdon's data.
 
59.5 of R23 was awesome in my last 270, but it had a long throat. I seated bullets out pretty far, but R23 was very good stuff,
 
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