There is a lot to be said for this philosophy.I don’t trust a case that’s been blown out not to rupture in my guns.
The only .40 brass I deliberately collect is once fire factory that I've seen fired (I know it's only once fired)...I process it for a friend who shoots it in his 1911. Any budges in these cases aren't due to overloading. I wouldn't even call them "guppy bellied"...I just think of them as Glocked