Lets see a .429 " dia bullet being pushed through a bore that is .410" dia and inside a chamber that most likely has a working pressure of under 30000lbs.
DO NOT DO IT !!!!!!!!!!!!!!, unless you have your estate all in order and I am named as the main beneficiary.
If you need to screw around with near death experiences why not try something a little closer in dimension, like maybe 41 Rem Mag?? At least the bullets are .410" dia, so you stand a far less chance of killing yourself and giving the gun culture ANOTHER reason to be maligned. :mrgreen: