I wouldn't worry about the caliber so much unless I was hunting in Grizzly country then I would chose the 300wsm. I would worry more about the weight and would take the lightest set up I had. All three of those rifles with Accubonds, Barnes, or any quality bullet will take a goat.
The Landowners of Montana have the right to charge an access fee to their land to shoot elk. The State of Montana also has the right to deny landowner permits, kill permits, Game fences, and paid hazers of elk during the summer months. If these landowners won't participate in allowing free...
I shot a goat in there three weeks ago and there were 25 ewes, lambs, and one small ram in the basin in between Beehive and Bear. I spent 15 days in there in Aug and Sept and that bunch of sheep never moved.