In 2009 my brother made his own 401 dies when someone died and he got a six shooter.
I told him we could reload with my Lee 40sw/10mm carbide sizer die.
He said his blood pressure hit an all time high. I have not talked to him about it since.
I don't believe he ever found the right brass, and so would be using 30-30 or 41 mag brass.... if he ever did shoot it.