IF,both rifles have not been trued/rebarreled or molested-
Measure the LENGTH of the bolt lugs.
.440" is mean dimension.
Swap the bolts & don't look back.
The last 4 digits of the receiver serial number are inscribed in the bolt body for identification purposes.
IF,either action has been trued/re-barreled you will need to take a couple measurements from the trued bolt for comparison.
