You NEED an unfired Miroku/Winchester 1895 Deluxe in .405 WCF as above.
You can shoot factory Hornady 300 grain ammo OR reload ammo from 210 grain .41 mag bullets to a variety of 300 grainers, or 400 grain .410-.411 Hornady and Woodleigh bullets. The latter for DG as Cape Buff in pic to the left.