it's funny, just not in the humorous way, that even when i wear my safety glasses, and a baseball cap, with the cap's bill about touching those glasses, a hot brass shell casing still manages to get in between the bill, and the glasses and onto my cheek under the glasses..!!
i have had shell casings bounce off the ports walls, and into my face, hit me in the forehead, go down my shirt, you name it, it's happened.
i have had my shell casings hit my guest in the head, if he stands just off to the side of me, watching my target.....
and there have been times i get hit with shell casings from the shooter in the port next to me, as his casings enter my area, then bounce off my walls.
i just never been hit as hard as you have been.
that suggests to my limited experience over these other guys, a hot loaded cartridge....
i'll say this too...try another gun, hopefully with the same "lot number" as the box you just used, and see if anything happens then as well....
easier to blame the gun 1st, then the ammo....
but still, call S/A, and explain it to them....