I can understand that if a barrel is screwed into a receiver by the sort of person who believes in tightening up wheel nuts until he hears a satisfying screech, then the force involved will create an enormous bursting pressure that may crack the receiver - or even initiate a crack that only becomes apparent much later.

However, I utterly fail to understand how these forces - which create an equal compressive pressure on the barrel - could cause a cracked barrel.

Could someone please enlighten me?
What we have here is a case of excessive exuberance.

While the docs are valid historic writing, the data clearly is not.

Nothing exists in a vacuum. If all the other data shows the 1917 was reliable and had no failures, then you have to question anything that says it was not.

The 1917 was a common modified gun, lots and lots. It was used for large magnums due it its sturdy nature. Its been in the Greenland Patrol forever. The Danes made their own barrels for them they had them so long.

Chuck in Denver has worked on 100s (new barrels) and reports a few W and R cracked.

I have seen 20 Es and probably total of 30 E - R -W. None was cracked including an E that had a R barrel on it that had a thread cut off it.

The Barrels all have witness marks and those barrels have their sight slots cut out BEFORE they are put on a receiver.

So how can you over tighten a barrel that is matched t the witness mark?

Let alone the Urban Legend of Pneumai Wrnehe (all pictures show hand install)

And no you can't crack a barrel.