I've worked up 1 200 grain load, using the Nosler Partition. It sits on IMR 4350. I caution on posting charge weights, but would recommend to start with the manual listing and work up.

With 180 grain loads, 4350 is still a good powder and the Partitions can be pushed close to 3000 fps with good accuracy. H4831 gives good performance also, probably a little more velocity. I'm still fine tuning my loads for sheep season (as soon as my rifle comes back). Will post more in the future.

I can send you an email with some stuff I compiled when I first got mine. I asked this same question on a couple of different forums and compiled the answers.