Try 65 or 65.5 grains of H4350.
My Kimber Montana Loves 65.0 H4350 for 1/2 to 3/4 in. groups @ 3050 fps. Not super fast but a +P 30-06.
Hate to drag this up from 7 years ago but...
I can't find any reloading data that states the min/max load data for this setup. Not saying I don't trust y'all but I'm not fond of pulling data from message boards and playing with it. Can anyone point me in the direction for min/max data for 168 ttsx and H4350 out of a 300 wsm?
I'm also loading for a Kimber Montana 8400. Can y'all recall what COL y'all were set for?