I don't load for the .280, but with it's similarities to the .270 I would suggest trying H4831, RL-19, or RL-22 for powders.
H4831 and RL-22 are my favorites for 150gr in the .270 (which specs out almost identical ballistics-wise to the 154gr in the .280).
I suspect you would get good results with either powder...both of which are on the Hornady manual pages that rcairflr posted up for ya.
I may be wrong, but I believe that is against the rules.
You mean like posting a scan of copyrighted manual pages for free out on the web?

Just kidding ya...I do it too.
