I may quote a powder charge from a manual & mention which manual & that's about it, at least that is a resent & permanent decision. It makes sense to me to mention the components used, including which powder, but not the charge. After all, if they have all of the other info, they can look at a manual, back off 10-15% from max & work up slowly until you find the max safe load in YOUR gun with that powder & then it is good to back up a tad. It is good to remember that max in manuals can be over max in YOUR gun, so it is good to advise the reader to back off even then.
Besides, if you mention a load with the powder charge in great detail, with the velocity, someone who doesn't have a clue & has no experience with your gun or load will tell you what vel. you are getting with your setup anyway, so there is no need to state powder charge.