I have (2) 270's, a Remington & a Colt. Both shoot the 150 gr Partition very well, and as mentioned, 56 gr of 4831SC, makes for a pretty timid load in both of my rifles.
Particularly if you have once fired cases, from your rifle, you should be able to get better performance.

Imagine your grave on a windy winter night. You've been dead for 70 years.
It's been 50 since a visitor last paused at your tombstone.....
Now explain why you're in a pissy mood today.