Have you tried RL-33 in the .264?
Funny thing about loading for the .264 (which I'm sure you know) is that when you decide to have one in the stable, you've just signed up to be your own ballistician. (That is if you plan to get the performance the cartridge is capable of)
The reason you are your own ballistician is that there is very little load data published for the .264...... At least data with newer, modern propellants.
I've yet to see any with RL-33. I've tested a hell of a lot of powders in the .264 and nothing has come close in velocity to RL-33. I would think N-570 would work similarly from seeing what a friend has done with it in the 26 Nosler.
If a guy is loading 7828, US-869, 4831, or even Retumbo in the .264, he's stuck in the Dark Ages...
