All APP powders are inconsistent unless you take special measures to keep them dehydrated.
I suggest that you try BH209 if you can get some it is consistent under all the conditions I have used it under, if it is not available to you the try Pyrodex it is still the standard by which we judge some like 777 if you don't end up with a crud ring that you have to scrub out every shot it is a good powder. Lee