Your friend is an idiot and should READ the warning that every reloading manual comes with stating to NEVER start at maximum loads. Even Dillon's reply is not correct, as it is impossible to obtain the same exact components as what was used by the book's authors, unless you can get brass from the same lot, powder from the same lot, etc. Even two of the same models of guns can produce different pressures. So I'll say it again: your friend is an idiot - and never shoot anything he has reloaded in one of your guns.