Old stand by IMR-3031.
Might not be the fastest in one but it should work to send bullets down range.
Would love to hear where you're finding 7mm Remington Magnum data for IMR3031. I have several bookshelves full of old loading manuals, and even the first manuals published after the cartridge appeared in 1962 don't include any 3031 data for ANY bullet weight.
