Please help on bronze axes

[kronckew]

when metal is poured into a mold, the impurities and dissolved gasses tend to rise up into the sprue, one reason it's a bit bigger than you would probably expect. cast steel billets generally have the top bit cut off & thrown back in the scrap pile, i'd expect it's the same with ancient casts, unless the metal was extremely pure and clean & was degassed in a reducing environment.