I'm often the last one to the party. So I had to discover on my own that 10mm Auto brass made by PPU (Privi Partisan) can be trouble. Fortunately, I didn't have much of it, a handful of odds. I've since discovered this is a known problem. That is, the brass won't size down enough to take a new bullet and hold it. Some PPU 10mm may be okay. But try a few out first. You don't want to mess around with a bunch that turn out to be bad.
One guy did an experiment with annealing and could get them to size down. Which demonstrated what some people had thought and that was that the brass is on the hard side and once fired, it won't hold a new size when run through the sizing die. It's kinda difficult to anneal pistol brass, I'm not gonna do it. Besides, the heat applied during annealing gets awfully close to the head of the case.
Others have had problems with case head defects on 10mm PPU.
I've used several different PPU rifle cases without problems.
One guy did an experiment with annealing and could get them to size down. Which demonstrated what some people had thought and that was that the brass is on the hard side and once fired, it won't hold a new size when run through the sizing die. It's kinda difficult to anneal pistol brass, I'm not gonna do it. Besides, the heat applied during annealing gets awfully close to the head of the case.
Others have had problems with case head defects on 10mm PPU.
I've used several different PPU rifle cases without problems.
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