You will need the Magnum bolt face (.540). And you'll want to make sure what shank size you have on the 30-06 in comparison to what shank size the 300 RUM is, or if you can get it in different shank sizes. 30-06 is usually a small shank and the magnums usually use a large shank.
Just something you'll want to make sure of... Also, if DIY you'll need the wrenches to take the barrel off, and I recommend the go/no go gauges too.
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