You're gonna need a .223 Rem bolt at a minimum. The .308 bolt face is too large for the .300 Whisper. Don't know much about the Stevens rifles as far as swapping mag boxes, etc.
IMHO, it would be better to start with a rifle/action in .223 Remington or .221 Fireball. I'm getting ready to have my second Whisper bolt gun built and I'm pretty sure I'm gonna use a Howa 1500 action in .223 for this one. Had one built on a CZ527 (again, in .223) before, but it lacked scope-mounting options (a 20 moa base sure comes in handy with the Whisper at extended ranges). Many here have built on Rem 700 actions, but feeding/ejection can be spotty with that action. You're better to start with one of the mauser-type actions (ruger77, win 70, CZ527) or the Howa with it's AR15-style extactor.
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