Steel and Aluminum cases CAN be reloaded, but may not last as long or be as easy to work with as brass. Most people do not Reload them.
Almost all steel are Berdan primed anyways.
Berdan primed cases also can be loaded, but Berdan primers aren't usually easy to find here and even in the US they are not always available everywhere. Some people do work to convert the pockets to Boxer but only in the rarest of cases would it really be practical to do. There are a few Euro calibres that are brass with Berdan priming and Boxer cases of these calibres are hard to come by if not impossible.