Check your M1917's for safety issues. Eddystones especially..

[Doco overboard]

The attachment may be a reasonable explanation for problems with bursting barrels.

WF Vickery writes about threading problems when fitting square threads. He wrote that the preparation of the cutting tool for (Enfield Krag and Springfield US models) must be carefully (expertly done) done and that in cutting a square thread .001 clearance should be left at the top and bottom of the thread by machining the blank .002 smaller than the bottom of the threads in the receiver and then cutting the groove of the barrel thread .001 deeper than the depth of the receiver thread.

I could see production haste could wind up having a few bad eggs in the batch and that after some time in service harmonics having a negative effect especially after proof test.

Attachment 102501