I don't know about hot brass, but I once chipped the tile in a gun shop with one of those rifles. I had repaired it, and test fired it with two magazines. I always counted shots and as I was turning away from the firing point of the indoor range, I worked the bolt several times to clear the rifle, thinking I was one short. Then I pulled the trigger.
I was one short, and an examination showed a small constriction in the magazine tube, just enough to keep one round back. With that gun, it is not so easy to check feeding and I made a mistake with fortunately no harm done except to the floor tile and a nick in a cinder block wall. But after that, I was super careful with those little guns.
Jim