My 260 is 28" plus a muzzle brake. I went that long because the primary purpose of the rifle is to 'sit here' and 'shoot there'. So I wanted every bit of velocity I could get. As a result, my hunting load runs ~3000 and my target/varmint load runs ~2850. You can find all the specs here:
My 260 by MCR
If your intended use is as a 'carry' rifle, I would recommend a shorter barrel. Personally, I don't think there's much difference between 24 or 26.