Holley,I think you will find that several things enter into how consistant a powder is for you;how you store it can enter into it big time also what oil and cleaner, then there is the weather not only the humidity but the temperture conditions under which you shoot. I live in a part of the south that is hot and humid the asorbic acid powders [made by APP] is what I would use if they were dependable enough but the least exposure to humidity causes them to be erattic.As far as I know I have tried everything pyrodex is the most dependable here its easily available which is the big draw back on Black Mag; I have wonderful results with APP if I keep it in a special dehumidifyer.
What it boils down to as far as I am concerned is that hot or cold [I like to travel and hunt other places] humid or not good old RS holds closest to "0",thats not to say that in an other place some thing else might be as good or that some rifle somewhere might shoot better with something else. Also might mention that according to the strain gage that pyrodex and APP show less strain with max loads while still getting the same feet per second. Which means that people need to be more careful about overloads with the faster burning powders because pressure will skyrocket easier with them. Hope this helps. Lee