I've loaded for .270 for a good number of years. Oldest load was 130 gr bullets over IMR 4831. Load from 1970's manual did not differentiate the 4831s, and my load exceeded current max loads. For 130 gr bullets, I also have used 55 gr IMR 4350, 60 gr of H4831sc, and lately 56 gr of IMR 4451. For 140 bullets, I like 53 gr of RL16. For 150 gr, I've used 60.5 gr of RL26. Now that IMR 4451 is out of production, I ration my use of it.
If in doubt, H4831sc works with any of these bullet weights.