In all of my service, albeit very limited and sheltered, from 1963 to date, I never saw a breech explosion in a small-arm but had one 'doctored' as an explanation and heard of two at close hand and those two were explained in detail on the Joiuster site.
I would assume from that, that the trusty old bolt action Enfields, their Brens, GPMG's and pistols are pretty safe...................