I think they are way off on R26 at well below R25. I have used R26 mostly in medium 08 and 06 sized cases so it may slow down in the larger cartridges. It seems to in the 270 WSM and 7RM but still seems faster than R25. These are only approximate I know but this is an ongoing issue with R26.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli