bsa: Just like the 130, with the 150 in the 270 I would start with H4831.
The other "old" JOC load was 58.5 WW II surplus H4831 with the 150 Nosler Partition for a bit over 2900 fps from a 22" barrel. He used that load in Africa, India, and other hot places without incident.
I used the same charge from the 22" Douglas barrel of a Dale Goens rifle and it gave the 150 gr a hair over 3000 fps.
The H4831 we have today is a bit faster burning....(I think..some are finding it slower but I have not seen this) than WW II version.
I also would try 7828,but have only used it with 130's myself.
