You are so close in performance with the cartridges you have, when using the proper projectiles, with similar BCs, I would think you would be better off taking the money you would have spent, and upgrading what you already have.
Most guys I know have numerous rifles that are "almost" what they really want. I normally advise them to consolidate the bunch of "almost" rifles, and get one or two that are "Exactly" what they want.
That might mean a McMillan stock, Nightforce, whatevertype upgrade on a certain rifle. Most guys grab the same rifle every time anyways, so you might as well grab your "exactly what I want" rifle instead of fiddling with the ones that you are not really satisfied with.
That's the best advice right there. If you think you have an actual "need" for another rifle, you're playing stupid first-world games. If you simply "want" one, then follow Mackay's advice above.
