Hmmm. SAECO claims it casts at .452", and prices them right with Accurate Molds. I would opt for Accurate Molds and KNOW RIGHT TO THE GROUND that the ordered mould would cast at my specs right out of the mailing box. I have 8 of Tom's products, and he is 100% on hitting the mark or a few tenths over.
I have 4 SAECO moulds, and there isn't a flaw in any of them. They all cast on spec with WW metal, and gain a few tenths with richer alloys. IME, they spec on WW metal and gain almost .001" using Linotype. My usual casting temp is 675*-700* with tri-metal alloys.