I've had pretty similar results getting Partitions to shoot - they're a hunting bullet, and incredibly reliable, but they're a long ways from the most accurate pill out there. I can tend to get them down to 1-1.5MOA in most cases, but it does seem to take more load work up. Fantastic bullet for killing game, though.

The Accu-bond is a bullet I'd never doubt - reliable expansion due to the tipped design, but great weight retention for a tipped bullet, usually a bit cheaper than the Partition AND a better ballistic coefficient (not that it makes a HUGE difference at 400-500), and almost always accurate as all get out. Accubonds are good to go. They're my favorite big game hunting bullet in because I know they'll open, but can trust they won't blow apart so they can go deep. Just wish they didn't cost so much.