On every BA gun I have, when you slide the bolt back, the spring in the mag pushes a cartridge upward.
...where it is HARMLESS until you slide the bolt forward and lock it.
Can you clear the chamber? Of course you can. Can you clear the magazine? Sure you can.
Can you now close the bolt and lock it? Great!
Now the gun is unloaded and safe. There is no cartridge in the chamber.
Now put the magazine back in! TADA! The gun is now LOADED, but there is NO CARTRIDGE IN THE CHAMBER.
S A F E
You can also generally do the same real easy with any BA rifle or shotgun with a loaded magazine by simply depressing the next cartridgewhen you slide the bolt forward so it it doesn't catch on the loader.
The point was that the lady upthread zotted someone for having a loaded magazine as being the same as a chambered round. It's not the same, and it's not safe to not know.