My deerslaying friend Don wrote: Finally, got around to trying the .270W PPU cartridges you gave me awhile back. They shot as good as my custom loads. I was able to group an inch @ 100 yds. I can recommend them. The brass looks like it has been annealed,
Most commercial ammo is annealed. Commercial ammo has the discoloration polished off before loading. Milspec ammo leaves it on as proof the ammo was annealed.
I would think the cases have to be annealed. You can’t form flat brass into the shape of a case without multiple annealing steps. And while the forming doesn’t require a final anneal step, I would think you need one to make the cases ductile rather than brittle (to prevent fracture when fired).