I use RL22 and H4831(standard). If a 270 does not shoot with one of those,the rifle is unlikely to do well with much of anything IME.Other powders that have done very well are 7828 and RL25.Magpro was accurate as well.
The RL 15 load is a good and very useable if a guy is into making the 270 a 7x57 or 7/08,or wants 2900-3000 fps with a 130 and less muzzle blast.
IIRC,Jack O'Connor's early hunting with the 270(including moose and grizzly) was done with 49.5 of 4064 and 130 gr bullets.RL 15 gives similar results,no doubt.
