Steel cases are more trouble than they're worth. When a brass case is fired it expands tightly to the chamber dia. and then shrinks back down for easy extraction. Steel cases will expand and stay expanded and not want to release - then your extractor gets overworked trying to pull the steel case out. Brass was chosen for cartridge cases for a good reason. It works better than almost anything else. It's also much easier to reload and causes much less wear on your dies. The only time I could see using steel cases would be in time of war (like WWII) where we had serious shortages of metals. No choice in that case.
I never said steel cases would break your extractor - you did. I said it would stress it. I never said steel cases would ruin your barrel or that they were unsafe to use. You did. You claim that a steel case will be hard on your dies but harmless to your extractor. I give up - you win. Granted, there are a lot of "myths" regarding this subject but brass will always be a superior material for cartridge cases. Steel is not used just to be "progressive" or "modern". It's used because brass is not available - or the manufacturer is building as cheaply as possible. The U. S. used steel for cartridges during WW II - but as soon as brass was readily available again we stopped making cases from steel.