your comment regarding the possibility of missing a double charge is why i prefer bulkier powders in large cases. if i double charge my colt .45 unique load, it would overflow the case.
i save powders such as 231 and bullseye for limited capacity auto loader cases where a double-dose would be obvious. just my way of trying to avoid any potentially disastrous inattention on my part.
ignorance is fixable, stupidity is forever...