Great observations about personal experience which is the most valuable. For ARs I have seen videos of the barrels blowing up when fired to very high temperatures with a full auto receiver. But the AR is not really designed for sustained FA fireWR, in your above link it does not say under what "normal" hunting,target,or even plinking at a dirt pit,conditions the "poof" happens. What gun,what action,bbl condition (rough with tool marks),fwd velocity,rotational velocity,bullet makeup/design,etc. that a shooter could expect to poof a bullet after having departed the bbl,and not having hit ANYTHING on the way to the target.
I would suspect that the bullet comes apart AFTER it has left the bbl. This would,at least to a great degree,be due to centrifugal force. I have seen bullets spun at close to a half million revs and hold together. No . . not a .224" 35gr that is designed for a 22Hornet.
I personally have shot a M60 for a duration that is long enough,that the bbl is cherry red and semi transparent. This,when the bbl is subjected to 80-100 mph wind. Also salt spray and a 25knot wind. I have seen a long bbl M2 50BMG treated the same and fire fine.
I stand by my post #54 & 55. I feel that to "poof" a bullet the shooter would have to intentionally put together/combine the things that would cause this to happen.
Has it happened in the past ?? . . YES . . but it was most likely due to the shooter had suffered a "POOF" of the brain somewhere in his past.
The above are just one mans opinion. --- SAWMAN