You haven't got many responses. I did try R22, and got vertical groups with the 210 & 250 Nosler Partition, the 225 Barnes TTSX, and the 225 Swift A-Frame. The groups would average 2 to 3 inches. I thought it might have been my rifle, but I tried R19, and got good cluster groups (I guess that's the term). Average about 3/4 inch with the A-Frame, and the Barnes TTSX gave me 1/2 inch groups. 210 and 250 Nosler Partitions averaged about 1 inch groups.
I will follow this thread to see if anyone did have success with R26.
If you are interested in some Partitions (210 & 250), or some 225 Swift A-Frames, let me know.