My experience:
I use the 130gr SST in .270 as my primary deer/mulie hunting load. I usually load for accuracy, not max velocity.
I have tried several powders with the SST: Accurate 4350, IMR 4350, Accurate 3100 and H 4831 & H4831sc. I really wanted to use the 4831, but it was just not as accurate for me as 4350 (both IMR and Accurate).
I used RL19 (and RL22) up until about 15 years ago with Nosler BTs - they both worked great but I didn't try them with the SST. The RL19 & 130 Nosler BT provided fantastic accuracy, but the bullets separated (SSTs are much better). I would try RL19 for the 130gr. SST 270 load first. YRMV.
With 53.5gr of IMR4350, I get about 2875fps, little standard deviation... and .5 inch at 100 yards/ 1.5 inches at 200 yards. Accurate 4350 is almost as "accurate" with a little more velocity with the same load.
Be sure to work up any loads for your rifle...