Apologize if this is a stupid question. I read the posted "myths of steel cased ammo" in hopes of an answer, but I need someone to explain this. My local indoor range asked to see my AK ammo last time in, and all I had with me was steel cased Tula. They held a magnet to it, and of course it stuck. They said they have a new rule of no magnetic ammo due to it being too hard on their backstops. Last time I checked my casings don't go downrange. What am I missing??? Do the projectiles themselves in steel cased rounds contain something different?? Thanks.