Hiram, I had to go look to confirm that there was such a bullet. It must be brand new. The thing that jumped out at me is that it is plain base. Right off the bat, that means that it is limited to black powder speeds. Next thing I noticed is that it is .459. That is good. The Lee .457s often cast too small for some rifles.
Anyway, I can't answer your question. The mould is only about $13 bucks so it should be worth a try. I'd try it were it GC. Makes no sense to me to design a bullet to shoot flatter and then handicap it by making it plain base.
But, then, a lot of stuff that Lee does makes no sense to me.