you are probably correct on the nickel steels being the safest. I have spent many an hour looking for photographic proof of the so called low serial springfield KaBooms and all I've been able to come up with was a 1903A3 that got a squib and following round blew it up. the receiver was completely intact but the barrel was split from end to end.
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