Try to close the bolt without the barrel. Then screw the barrel on and headspace.

The gap between the actions lug abutments and the face of the barrel is space for one barrel. There is only .010 gap between the face of the bolt and the barrel. A longer bolthead will hit the barrel before the lugs can be rotated into place.

Here is some bolt head data.
http://www.savageshooters.com/conten...Configurations