according to the writeup at 1903.org almost all the failures ocurred either with way over charged cases or in cases where the poorly manufactured casings of the time failed, IIRC us ordnance dept issued a memo that casing failures were an occupational hazard.
ignore my complete lack of capitalization. I still have no problem correcting your grammar.
I never said half the stuff people said I did-Albert Einstein
You can't believe everything you read on the internet-Benjamin Franklin