What ro-bar said. Sort of...
If you shoot Wolff, shoot only Wolff. Don't mix steel and brass case ammo. IOW, if you shoot steel case clean the pizz out of your chamber BEFORE going back to brass case ammo. The steel doesn't expand and seal the chamber so it gets gunked it up. When you shove a brass case in there it expands and sticks to the gunked up chamber.
If you shoot Wolff, shoot only Wolff. Don't mix steel and brass case ammo. IOW, if you shoot steel case clean the pizz out of your chamber BEFORE going back to brass case ammo. The steel doesn't expand and seal the chamber so it gets gunked it up. When you shove a brass case in there it expands and sticks to the gunked up chamber.