*PLEASE NOTE THAT THIS IS FOR MY RIFLE, ALWAYS APPROACH A NEW LOAD CAUTIOUSLY!!*
Rifle is a Pierce long action, 32" 1:8.5 twist Swan{Au} barrel
{You will want a 1:8.5 to run the heavies but can get away with a 1:9}
Peterson .280AI brass, CCI 200 primers, 56.5gr of 4831SC, 184gr Berger Hybrid.
One thing that could give an issue is Montana can be very smokey during that time, so just keep that in mind.
Bozeman has a very nice hot spring, its more modern, Norris hot springs a little more rustic.
Everything you mentioned is a great start.