Sorry, but I don't have any data for 458 Lott; my gun is a 458 Win Mag. On consulting the Hornady manual, I find that for some powders and 500 gr bullets (my favorites among them) they recommend lower starting loads and lower maximum loads for the 458 Lott than they do for the 458 Win Mag. Based on that observation, I would be cautious about substituting 458 Win Mag data in the Lott cartridge.

Take care, Tom