You'll be fine building on a small shank action. Savage increased the shank size on the WSM's to alleviate any issues there may have been with cases sticking in the chambers. It was said that the chamber walls would expand enough to allow the cases to expand more than maximum and when the chamber walls returned to their normal size, the brass was hard to extract. I've got a couple of small shank WSM's that are fed a steady diet of near max loads and haven't had any issues with extraction.
Primer pockets are a different story, however, and I've found a fix for that.
Tell me what's different about a Remington chambered for a WSM?
Same shank diameter, same action diameter......
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