Call McMillan. Their SPR stocks are listed as SPR profile. If the #10 contour is larger than the SPR barrel, then it will fit, though there will be a larger gap between the barrel and stock.
I think it will work. Looks like a short action model 70 inlet and an MTU barrel. I think the FN contour is close to the MTU profile. Just looking at the picture of the barrel I would say it is slightly fatter that the FN profile so there should be room.
This is just my .02 worth. I would confirm with McMillan.