The 270 and 280 bounce off those darn saber tooth elk.....
I can't speak to the 280.... with the 7mm bore and a better bullet selection (more "heavy for caliber" options)it soundslike an improvement.
I can say I HAVE witnessed some shots on elk with a 270 that I WISHED had bounced off!
It would have made for a much happier story!
Just my experience.