I know, I know, buy the book...........

Need the following data:

260 Remington

140 gr. GameKing BTSP & Alliant RL22 powder

What is the MAX they list?

If they don't show RL22, what about H4831 or RL19?

Tod the Sierra V has nothing with R22 or H4831 and the 140gr bullet. They do list R19 @ 40.0-44.5 gr with the 140s for 2700 fps.
I have the hornady and Speer manuals which I know have data with these powders in them. If you want their loads let me know.
For what it`s worth I found R19 works best in my 260 both for vel and accuracy with 120 - 129 gr bullets and come in a very close 2nd to H4831 with 140s accuracy wise but still gives highest vel.