Owning precision rifles is always fun, but I will throw out my perhaps controversial method of rifle decisions, keeping in mind significant budget and time limitations.
I like to have at least a 2x "difference" in bullet mass and ideally some very significant difference in targeted application to bother owning a rifle, more if possible. It isn't just about the rifle, it is also the infrastructure to support it and really being "intuitive" with it.
There is nearly nothing that your .308 can do (hunting wise) that your other rifles cannot do already, so to me that one is more or less optional. That doesn't mean sell it, it just means it would fall out of being "necessary" or worth really thinking about in how I think about "doubling up."
The next step, IMHO, is to move to something in the .338 size range with flat shooting characteristics, over 3000 fps with high BC bullets. Don't discount bore rider bullets in your thought process.
A .338 like this can really reach out there for a variety of game.