I've heard it could be good as well. I'm on the look out for Retumbo, N570 & RL-33. I have RL26, RL25 & H1000. I know H1000 seams to be the go to. I have a RUM eating my H1000. Was just looking for other options with other powders I have on hand.While I have a deep commitment to Re-26 in several cartridges/bullet combinations, this is not one of them.
Re-26 does not fill the case sufficiently in my opinion to yield the best velocity for this combination. Re-25 is better but still a little fast for the combination. I have used:
Retumbo
Re-33
Norma 217
VVN-570
What I can also suggest is to try the 250 gr. to 285 gr. bullets instead of the 300 gr. anything.
Enjoy your search!