Tough, open-ended inquiry. Been hunting and been in guns my whole life. Any decent caliber fron .243 to .338 winchester will be fine (depending on your sensitivity to recoil.) For entry level accurate bolt actions I like Ruger american, Stevens 200, Marlin xl7, weatherby vanguard, Remington 780. For a step up consider a Remington 700, Ruger 77, Tikka, Browning, or winchester 70. More important than the gun is the scope. I personally prefer Leupold VXII in 3x9. You really can’t go wrong with the rich selection of bolt action guns and calibers available. If ammo availability is an option go with .243, .270, 7mm mag, 30-06. .308
oh yeh. . oops! Don’t forget Savage 110. Probably the most accurate off the shelf modest priced bolt ever made!