Duke, I don't think there's any reason to get your hackles up, I think we're both interested in the same thing: some real data. When you said the extractor would blow off in a few shots I asked if you had any real experience with such an occurance and you were silent. I do have some limited experience shooting .40 out of my 10mm without any issues, but I have read that article, and had an experience with .380 in a 9mm which at least gives me pause:
I send my slide off for milling work, so I've haven't fired any more .40 through it, but I did do an interesting experiment with a .380 case which made it's way into my 9mm loads: it was a light steel load (3.15gr Clays under a 115) so I figured I'd shoot it and see what happens
It chambered fine and I could see the rim was securely behind the extractor so I shot it; it sounded funny as the brass fire formed to the chamber, but when I extracted it I could see what this article warned of: there was a scratch in the rim where it pulled past the extractor with the primer ignition then it was slammed back into the breech face, flattening the primer against the head stamp.
Granted, this is obviously less likely to happen with 40/10 because the rim is exactly the same, but I can now see how it could happen.
I'm not as interested in silly internet squabbles as I am in sharing real data and making informed choices, do you have any data to share?