Just a personal preference, I don't care for the .270. I know that it is a great cartridge, just don't like it! The 7MM RM is a great choice, and the .280 Rem. is not far behind!If you go with the 7MM RM, I'd use a lighter bullets on deer size game and heavy bullets on big game!
I know that there is no such thing as "going too fast to expand." But, at close range, the heavier 7MM bullets do not expand well on deer size game!