Um...sorry. All apologies for my not so clever ruse. It is clear to all who spotted the blatant red herring that the idea of loading a rifle with something not designed for it could be dangerous.
Next I’ll be showing pictures of people in a Toyota killed by Takata airbags while warning you about your Chevy airbags. Carry on.
That's not what he asked; he asked whether the bolt guns in .223 would handle 5.56, and the NEF; I can speak to both of them. I have fired 5.56mm M855 in 2 bolt action Savage Axes, (The correct plural form) and an NEF Handi-Rifle. There were signs of high pressures in all of them. Flattened primers and rough extraction, and sometimes no extraction from the NEF. Convinced me enough to stop firing it in .223's. When the ammo incapacitates a single-shot rifle, time to stick to the correct ammo.