I just came across this thread. I have a Kimber 8400 Montana in 325 wsm that I reload for. I have found 200 Accubonds to be quite accurate. Particularly with Ram Shot Big Game, but also with IMR 4007 ssc and RE17. IMR4350 has shown a lot of promise with both the Accubond and the partitions. I have wanted to try the 220 Sierra but haven't been able to find any locally.
Have fun. My cow elk went down hard from 330 yards in November.