Cast Bullet Question

[Drew_CarreyAB]

I am using a 457FN mold and it casts out around 460 so I have been using a .457 and a .451 lube sizer dies (still need the .454) to get them down to .451 to use with sabots in my 50cal MZ. The bullets cast out around 450grains, and I plan on using them for moose and or a close up deer. Is this too much work to use the bullets or can I get/find a mold to cast out around 454 AND be 450+grains? The Lyman rep says that sizing from 457 to 451 is kinda a tall order(I broke the press while doing it LOL) She said that sizing 6 thou plus is pushing the limits of the equipment.....Can a fella find a 504 or 505 cal die to use or would I have to get one made up? The questions a lots and they are all over the place (like my groups) LOL but I'm tired and thought I'd post the questions................any help appriciated Thanks