I was under the impression that it wasn't as critical on a Savage action due to the floating bolt head. I know Remington actions are more critical and need a real truing fixture and a mandrel that goes in the bolt raceway with 1/2" bushings and you indicate off that. My depth mic is an ez read Fowler. There is a cap on the back which I took off and there is a screw. I'm assuming I need to loosen this screw in order to remove the stem. I'll play around with the depth mic later today.