For the Lott---at 2300fps, with a 500 grain woodleigh---I use 84grs. of IMR-4320 for 5,875 foot pounds. Which holds it's own with the .500 Nitro (in energy only).
This is not from my own development, this came from ol' Jack himself, in his notes.
Although he said he backed down to 83grs. to eliminate stickyness in extraction, but I personally have never had that problem in any situation whatsoever, but maybe I'm lucky.
For an even 85 grs., it will go 2330fps, and develop 6,020 foot pounds. I've used that particular load successfully before on game, however, I've backed down to 84grs, as a norm now for myself.