You dont have to have a large shank for a WSM, although most likely all of the factory WSM barrels you find will be large shank.
Seems like I remember reading that they did make small shank WSM rifles for a year or two, but I could be wrong.
With a custom barrel it does not matter.
I think there is something about the firing pin assemble when going to the magnum, IE it should be changed.
You might want to ask SSS.
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