I have also run a ton of steel case thru .380,9mm, .40, .223. I have never had a bit of trouble except it does get a little dirtier than others some times.......Until today.....

Went to the range with my AR 15. Started out slow, built up to
running a couple of 30 round magazines rather quickly. It was wolf steel case.

Got the rifle pretty warm...and, u guessed it...for the first time in thousands of rounds of this stuff..a FTE. That case was stuck in the chamber good. The very first time I have ever had to run a cleaning rod down the barrel to pop out the case. Don't worry fellas, it was a spent round, good pin strike....

I'm not gonna change, the gun was filthy..not bad after all the steel cases I've run through everything I own.

I think we got it hot enough to get the polymer coating on the case to weld up a bit in the chamber.

My .02 worth.

Regards.