If one is trying to project their "savings" from reloading by using the same brass multiple times, I don't think "6" is an unreasonable number to use. It's neither too optimistically high nor too low.
“Political tags — such as royalist, communist, democrat, populist, fascist, liberal, conservative, and so forth — are never basic criteria. The human race divides politically into those who want people to be controlled and those who have no such desire.” — Robert A. Heinlein
“It does not require a majority to prevail, but rather an irate, tireless minority keen to set brush fires in people's minds” — Samuel Adams