[sam_paine]

If you open the bolt with a loaded mag in the receiver, a cartridge will be pushed in.

No, it won't.

Open bolt == "SAFE GUN"

If you CLOSE it as you say, and LOCK the bolt then you are back to "CHAMBERED" which is where we started. The OZ lady misunderstood "loaded" to be synonymous with "chambered" It is not.

Note the difference.

ROUND CHAMBERED = NOT SAFE

LOADED but NOT CHAMBERED = SAFE

You can close the bolt without chambering a cartridge in pretty much anything with an open breach. If not, pull the mag, cycle the bolt till clear, then close the action while clear, then load the mag. AGAIN, LOADED but NOT CHAMBERED and STILL SAFE!

[editor-surveyor]

On every BA gun I have, when you slide the bolt back, the spring in the mag pushes a cartridge upward.