No, no, and uh, no. The steel in Tullamo and Wolf us soft, it is an alloy. The brass colored cases you use are not brass, they are an alloy. The steel cases are not quite as resilient or springy as the brass so they will start sticking earlier as the gun gets dirty.
I have been reloading steel cases for about 11 years, just because some guy who had no clue said it could not be done. I reloaded 50 brass and 50 steel cases six times, three if the brass cases split, none if the steel ones split, 45 acp.
My buddy and another guy started forming the Tullamo cases into 400 Corbon, last year. To our surprise, they formed just fine and not one of them split. What we did find is that steel cases do not slide as well, they are too soft to hurt your gun or chamber, but they do not slide well, so if you have a nasty, dirty dry gun you will get feeding issues sooner.
For example if you see guys getting ARs really hot and dirty, they are asking for a stuck case much sooner with steel than they get with the brass alloy ammo. Simple deal, ARs should have polished chambers and ran wet anyway, sonny time you see that it is really operator error. Nothing wrong with the steel.
You might note that Hornady Black and Hornady Match are steel cases. The general rule is steel us safer than brass, it takes more pressure.
So, no steel per se will not ham your gun. Sone of the import 9mm Plus P Plus that was designed for submachine guns will beat your gun to death, but not because if the case, the pressure.
Keep your chamber clean and lubed and never too hot to touch with a finger and you should never notice the difference.
I shoot lots of 9mm and 45 acp hardball. I had no time to reload due to job so I bought cases and cases of Tula and Wolf. I shoot hard and fast, run by a range and fire 150 or so and go. Never ever had a problem. I am retired ,
Military and LEO. I polish the chamber on every gun I carry about once per year, I use Flex Hones, I do not have chamber issues with steel or anything else.
I recently bought ten boxes if 357 mag Tula at Academy and have reloaded those cases for my ever action 357s and they are fine so far.. I have tons if brass cases, just load the steel ones because keep hearing from people who gave no clue that it cannot be done. Lane Pierce at shooting Times did an article on it eleven years ago, Google it.
Steel-Cased Reloads, Cracks, And Fireforming Wildcat Cases - Shooting Times
IMHO