Looking at Peter White's website, the A10 650b x 40mm is actually running closer to 38mm wide, so they have less volume and diameter than the 47mm OEM tire.

Dave at Priority is very interested in this discussion (not surprisingly), and based on my report to him about the issues of 650b studded tire fit and A10 availability, he purchased a set and mounted them on one of his cycles. He confirmed that the volume (and overall diameter) is less with the A10, and he recommends adjusting the fenders accordingly and purchasing smaller volume tubes than the 47mm tire requires. Other than that he thinks this studded tire option is the best for this cycle and wheelset.

I'll be adding a more detailed report and pix this weekend.