My recommendation for a larger caliber, especially since you already have a 300 wm, is 338 win mag. Components are easy to find. Good bc bullets. Many rifles chambered in it to choose from.
My Ruger M77 in 338 wm is sub moa with both handloads and Federal premium ammo.
Your other options will also be good rifles. Choose the one that fits you and is comfortable. It also wont hurt if you like the looks of a gun.
You can't fix stupid....however ignorance can be cured through education!