Steve thanks for showing the results. I don't know what to think. As an aside, I was told that PPU uses a brass alloy for cartridge cases that is not pure brass. Consequently they are harder. Not being a chemist I cannot confirm this but I do know PPU brass is harder. Do not know if this will have any affect on annealing.
Not sure what you mean here. Brass is an alloy of copper and zinc, the ratios of which are tightly held by manufacturers everywhere for strength and ductility reasons. Brass alloy number 360 is the metallurgists name for it, also known colloquially as cartridge brass. Frankly I doubt that PPU deviates from the standard by mixing in other stuff - for added hardness/strength you sacrifice ductility and vice versa. I could be slightly off track though this is how I understand it. A dissertation by a a pro would be welcome.
