I would get the 7mm RM. Personally not a fan of the short magnums.
IMO what you gain, (slightly less weight, and only in an action that IS length specific i.e sako), it not worth the reduced barrel life, expensive brass, less common ammo, not as capable of running heavy pills etc.
I would personally go the 7mm, and id also choose a regular .300wm over the WSM.
The belt can be completely ignored for reloading purposes.
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