A lot of the "brass" hulls are really brass plated steel anyway.
If it makes it thru the sizing ring in your shotgun press it is "sized", no matter what it is made out of.
Remember to use sizing lube (anti-seize compound) on every 5th or so hull.
If for some reason you find you are using excess force to size whatever ranging pickings you have run across, a MEC Supersizer will size ALMOST anything. Ironically, the once thing it won't readily resize is an all-brass Magtech hull. For those, the only thing that will work is the RCBS shotgun die set. If I knew that before I got the MEC Supersizer, I would not have gotten the Supersizer and gone directly to the RCBS die set, which I eventually wanted anyway for Magtech hulls.
It is nice to have a set of small, medium and large hammers at your disposal.