Consider the following which was posted on this Forum a few years ago:
LAMINATED BARREL COMPARISONS:
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"We have not performed destructive testing to chart specific hardness or steel composition. The gauges that we use are machinability, dent raising, striking, polishing, and contrast at initial etching. Higher grade steel is more difficult to machine and shows less contrast at etch. Softer steel is easily machined and shows bold contrast at etch.
Based on these observations I would rate in descending order: Laminated, Damascus, stub twist, plain twist, Parker twist.
Brad" [Batchelder]
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