Well being that the pressure is concentrated in the chamber, that's really where you want the extra material. The action itself doesn't make much of a difference, but being able to use the larger diameter barrel gives you the added piece of mind with higher pressure cartridges.
Like I said before, is it probably fine? Sure. But if you have the option to have bigger and better all else being equal (cost), you're saying you'd rather not? Point being, there's no reason not to use a large shank.
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