Don't over think the cast bullet thing. I cast & shot lead for 25 years with no guidance except an old Lyman Loading Manual which contained some casting instructions. It wasn't till the internet came along that I found I'd been wrong for all those years. Still the only problem I had was some leading to clean. Guns shot good & killed good & were plenty accurate. In your case order as mould of standard weight that cast large enough to size .454" & some Carnauba lube from
https://lsstuff.com/.
