Many Mausers appreciate about 1/2" to 1" of bedding ahead of the front action ring on the shank. The bottom of the recoil lug should not be contacting bedding material, thus the action can be drawn down hard against the flat behind the lug. The the sides nor the front should be in contact, either. This was taught to me by the accuracy shooters I played with back in the 70's - when many of us used 98's (mostly VZ's) for our match actions. The sides have some taper and this can cause unwanted wedging. The top side surface of the action can be a snug fit through a 'ring' of bedding around the action. The tank should also be bed to that area. there are mixed feelings about the rear surface of the tang. Some feel it should be not bedded hard, while others demand it. The loose crowd think if the rear of the tang is bed to the stock, this does not allow movement and will split the wrist. The others feel if the action is properly bed at the recoil lug, it cannot and must not move - I belong to that crowd and have never split a wrist behind the tang.
The extractor should have a couple thou clearance to the barrel's rear surface, imho. The barrel should bottom against the inner ring. This is what I was taught.