Actually Ray, the sixth FAQ from the top addresses barrel wall thickness and to the best of my knowledge such recommendations as stated in that FAQ apply to both fluid steel as well as composite steel barrels in 12 gauge guns.
Both Bill and Brad give good advice on the subject and I would urge anyone with an interest of the safety of Damascus barreled guns to read each installment of Sherman Bell's "Finding Out For Myself" series in the Double Gun and Single Shot Journal. No, it is not an experiment endorsed by the scientific community and is not as 'controlled' as laboratory procedures would dictate.... but it's good enough for me!
I shoot Damascus barreled guns (after I have thoroughly inspected and measured them) with every confidence.
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