I have never tried to reload a steel case hull. I can foresee to many problems.
steel head reloads just fine, I have loaded hundreds of slugs back in Remington Gun Clubs, Sport Load, and hundreds of 00 buck in Federal Top Gun hulls.
The fact is that it’s the plastic make up that makes a good reloadable shell. Remington Gun Club is a good example. They take the identical load data as STS/Nitro 27 because the construction is the same internally, the plastic is good for multiple reloads and the steel head can be sized many times over the time the plastic starts splitting.
Federal Top Gun(breast cancer edition),buffered, 10 pellet 00 buck 1 1/4 oz , 10 yard target....never a problem I didn't create
And there is nothing wrong with ESTATE as long as you load them back correctly.