I've used it with great results in 260 with 140 VLDs.I was very fortunate to pick up a nice supply of RL-26. I got it mainly because it was available and used it for some trading. I have not ever loaded any of our cartridges with RL-26, but want to test it out.
We have Retumbo, H-1000, RL-26, H-4831SC, StaBal 6.5, H-Hybrid 100V, H-4350, CFE223, Varget, H-4895.
As you can see we have a variety of the Slower to faster burn rate powders. We load .204, .223, .243, 6mmBR, .260, 6.5X284, 270WSM, 325WSM, 338LMAI.
What cartridges are everyone reloading with RL-26 and getting good results???
It should work well in the 6.5-284 and the 270WSM but I've not tried it so that is speculation on my part.