I have two SB2 357s, one is .740" the other is .742", my 35 Whelen is .658", makes ya wonder why they didn't use same contour for the 357s.

As LaOtto said, there's always exceptions, they prolly turned the barrel to the wrong contour than they normally use for the 357, as far as I know, all CF rifle barrels start out from the same blanks, 36" IIRC from a previous discussion with Gordon at Gardner.
Tim