Yup pretty much. You will also need a standard firing pin to go with the 308 bolt head, because the WSM's use a longer firing pin that special only to the WSM based rifles.
FWIW I would just invest in a Lee Reloading kit and roll your own 300WSM ammo. It will be cheaper per round and you will end up with much more accurate ammo and a great satisfaction of doing it yourself. Trust me I know, I have only bought 1 box of centerfire rifle ammo, and 2 boxes of 380ACP ammo since I started hand loading and I am much happier, especially in these times of difficult to find ammo, let alone the same brand and bullet weight.
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