.223 vs 5.56?

[jmoore]

But that was the reloader's fault. I still maintain no problem.

Noted!

...it was the owner's fault for getting too aggresssive with his loads.

Nor was he shooting 5,56 even though the rifle had some sort of wretched M16 magazine conversion which reduced the thickness of the feed area behind the lower locking lug. The point being that bolt handles on modern Remingtons aren't as stout as the old timey stuff.

langss was the one with the cautionary example which seems not out of the question.