

Is this normal when shooting milsurp steel case?
Shot a stripper of my trusty crusty milsurp for the first time out of my 91/30 this weekend, and noticed the cases were splitting almost the entire length of the casing. I have shot probably a hundred or so rounds of modern brass case out of it and haven't seen anything like this. Number 5 isnt pictured because it didnt fire after two pin strikes. Should I be concerned?