I chrono'd 9.2gr of H4227 at 846 fps. This load fills the case roughly 65% and cycles my 10" Whisper reliably. I plan to try 10.0gr to see what velocity that gives me.
9.9gr of W296 gave 983 fps and filled the case 55%.
H322 is also worth experimenting with. I found that 13.6gr gave 996 fps with 85% load density.