Eleanor O'Conner shot 27 head of African game with 28 shots, from her 7x57 Mauser using factory 173/5gr. ammo. Of course, the text said the "extra" shot was not needed.
Her husband's "score" was not anywhere near as impressive, to the point, I don't even remember what it was. What is more likely, is that it was not mentioned as he was using a .270.