The guy may be a crummy writer but I think you're trying too hard to find fault with his story.
And you're making up ridiculous situations to prove my comments wrong. That's OK, I guess. Your goofy scenario is essentially making the chamber 6" longer with an abruptly short forcing cone at the end.
However, I'll withdraw all my picky comments and heartily recommend that everyone read and enjoy the brilliant and informative article by Nick Sisley.
Never argue with an idiot. You can't win and people will not be able to tell which is which, after a while.
