That's rockin along for a 450gr bullet. I'm sure that's got some serious "swat" on the receiving end, both directions. My thinking was to try H4350 since the powder charge is a little less to help mitigate some of the recoil, however it may be a moot point.
Have you taken any Buffalo or other dangerous game with the 450gr Woodleigh? Are you regulated both for softs and solids in 450gr?
I haven't seen much of anything available from Woodleigh since the shop fire. Northforks are available from Reloading International.