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You will only over-expand or over drive a bullet if you use the wrong bullet. A lot of bullets are made only for a particular velocity range. With today's bullet technology, you can safely drive a bullet at the top range and not have it come apart. Myself, I have a 375 Ultra project that is ongoing and see it as a true one rifle Safari gun. All you have to do is see how much success Saeed has had with his (375/404) and his bullets have all held up admirably. The day of having wrong bullets is really in the past unless you're choosing it for the wrong application based on erroneous information.