Lucky, More importantly is your early 300 wsm control round(stagger fed)[Which it is.] or the push feed ( center fed) action. The older stagger fed rifles used a standing ejector. The action had a machined provision for the ejector the was secured by the trigger hanger pin. The more modern WSM's had a push feed bolt head with a ejector pin that was in the bolt face itself. The first picture is a control feed from a stagger feed wsm. without the ejector and the machining of the action for the ejector it will not eject using this boltface.
and the ejector.
The bolthead you want is for the pushfeed design for the more modern centerfed action. And all of the parts to go along with it. The extractor, ball and spring, the ejector pin, retaining pin and spring and more than likely a firing pin assembly.
It has been forever and a day since I tackled this job but this info will get you started in a direction that will give you a better understanding of what your in for. I'm sure I missed something or goofed this post up but hopefully together we can get you the right information.
One last thing.....You might be able to modify a long action magnum bolt head to keep from needing a firing pin.
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