I like the 284 or the 6.5 version for your build, since you've got the right action.

A while back, I started thinking about what I considered to be the ideal dimensions of a case for a LR hunting cartridge. I came up with a set, and then later noticed that the 284 case is the shortened version of my ideal case design. I think it would be ideal for you.

I belong on eroding granite, among the pines.