Oh, man, that .280 is a GREAT caliber - as good as any, just overlooked quite a bit mostly because of suicidal marketing by Remington right from the start. Anyway, it's one of my favorites. I've killed everything from antelope to big bull elk (at around 400 yards) with it. It's exceedingly accurate, has plenty of power, moderate recoil - it's just a fine round! I've had very good results using 55 grains of RL 19 and 140 gr. Nosler ballistic tips - it kills deer like they were hit by lightning and shoots 1 inch groups. I am curently trying 140 grain Barnes TTSX with 53.5 grains of Hunter powder though I haven't hunted with it as yet. Hope you keep using that .280 - it's TOO good a caliber to abandon. Good luck!
P.S. I also have a 270SWM and 300SWM which are great, but the .280 is just as effective in my opinion.
P.S. I also have a 270SWM and 300SWM which are great, but the .280 is just as effective in my opinion.