bolt question


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45R
March 11, 2006, 01:34 PM
What does someone mean when they say "Trueing the action". How does this help a bolt rifle?

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DnPRK
March 11, 2006, 02:00 PM
In the perfect rifle, everything in concentric and/or perpendicular to the barrel's bore. This causes all forces to act repeatably and puts every bullet through the same hole in the target.

Unfortunately, all mechanical items suffer from the effects of manufacturing tolerances. This means that a manufacturer has an established criteria for what is acceptable from his tooling, and its far from being concentric and perpendicular.

In the case of rifles, this can mean the face of the receiver is not perpendicular nor centered to the barrel's bore, lug surfaces in the receiver not square to the centerline of the bore, lug surfaces on the bolt are not perpendicular to the bore, bolt face not perpendicular nor centered to the bore, firing pin hole not centered in the bolt face, bore of the receiver not centered to the bore of the barrel, and excessive slop between the bolt and receiver bore. A trued rifle will correct these manufacturing tolerances.

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