Yes, but... Is there a really good reason to buy a .280, or a 270, or a 7mm Mag, or a 7mm-08, when you already have a .30-06 and a .308? Why get something that is so alike to what you already have? I'd go for a little separation. Get something significantly different from what I already have.

.243 Win.

.338 Fed.

Maybe a .223 in an AR Platform... while you still can...