My understanding is that the ring sizes are the following;

34.24mm WBY
34.40mm Sav
34.65mm Rem
35.59mm Mauser98

I measured the Sav and Mauser. Between the Rem,Wby and Sav the difference is inconsequential, however barrel shank wise both the savage small and large stand apart due to their finer thread and pitch i.e. most 'meat' around chamber.