Welcome to the forum!
Let's see..there are staggerfeed, and center feed actions. Long and short actions. You'll need a long action for a 300wm build, and if you were to find a 30-06, 270 etc, you can always change the bolt face to a magnum bolt face for the 300. You can probably find a used one and build from it(that's how I do most of mine).
Actually you could buy exactly what you're wanting unless you're just wanting to build. 😆
Barrels are available from several of our sponsors here, stocks as well. I know there's several more questions you have, but this will hopefully get things started for now.
Scooter
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