Kinda like RL-15 in the .375 H&H. There are other, higher performance options, but that one has been so good for so long, few want to change.
RL-22 has been a go to powder for 180's in the .300 Win, maybe not as universally popular as RL-15 in the .375, but widely used.
I have a big jug of MRP, which I also use. It reportedly may be better stuff that RL-22, but I can't tell the difference. They both work well.
Curious that H-4831 is the Nosler accuracy powder for 200's; it's actually a bit faster burning than RL-22. You'd think the heavier bullet would prefer the slower powder.
If you're looking for that 'magic" load, you gotta go with what others have found to work and what their go to combo may be.
DF
