I need information on wat powders to use in a 450 wildcat in a Martini Henrey tilting block action.
The parent case is a 458Win,the beld is turned off, so that you can not chamber a 458win.
The aim is to held pressure down to below 35000psi.
bullet is 500grn lead with gascheck.
Barrel is original Henrey segmental.

look at the 450 marlin.. same sort of constraints, for lever guns, in reinventing the 458x2"