Tell him you can, and film it for the rest if us to watch!
I can't see him even trying, You'd load a 300 whisper or whatever, and it'd rattle around in the chamber. Odds are if you pulled the trigger, the round wouldn't be close enough for the primer to be hit. You'd have to get fairly unlucky, and have the extractor hold it againest the face.
If you tried a larger round, say a 30-06, it shouldn't rattle around so much, so, well, who knows? That's why I'd like you to film it. Might be septacular! Or try the 338 whisper!
Springfield 1911 black loaded target. 460 Rowland.
M&P 40 Pro.
To be voluntarily disarmed is to rely on the honor of the dishonorable.