The 140s and 160s shot amazingly well in my 7mm RM and also do well in my 280AI. The 7mm RM loved Re22 and IMR7828. I'd give some of the newer more temp resistant powders a try, but not sweat it too much.
Can't go wrong with either weight in 7mm. The rifle will tell you which bullet and powder it likes.
Agree that confident, quick and accurate engagement is key to really any shots on game. That means lots of practice from every field position you can imagine. Get off the bench once you choose the load and never look back.
"Whether you think you can or you think you can't, you're right." Henry Ford
