Have you heard how the Barretts shoot or if they will ever make a .280?
I haven't seen a lot on the Barrett yet. I think it will be very nice given the company reputation. That link I posted didn't show any paper targets but it did show head shots on a steel silhouette with the 308 from 475 yards.
I think they list some calibers on the site. I only remember short action calibers for now.