Been using AA#7 for years in 9mm for both cast loads and JHP loads. Never any leakage through my RCBS Uniflow. The only problem I found is inconsistent supply. Right now I am using Bullseye to great effect, since I can find Bullseye local and not AA#7. I do know they reformulated all the Accurate powders some years ago, so go to the Accurate Arms website for the latest free load data.