Liked the video. I accidently mixed up some CCI 450s and used them in my 9mm Shield 2.0. Light strikes were the name of the game. I assume the magnum primer's thicker cups is why they didn't work. No pressure issues.
Back when I use to play the open IPSC game I always ran SP-Magnum primers in the 38 Super. I would love to see this down with all the primer brands especially through the pressure barrel.