One could even argue that unless the tank pressure is exactly the same every session and the nozzle(s) pointed the sand place and distance on the cases, and nozzles never sputter, you won't get the exact same result each time with the Bench Source, Annealeez, etc either. They're still much better that other methods though, I'll agree.It's not opinion, but fact. Are you holding the brass in the same exact spot every time? You're not. are you taking the brass out of the flame at the exact same time every time? Again, you're not. Annealers like the Bench Source and Annealeeze do just that.