John, I think Magna flux would be the better of the two options. We used to have a company here in town called Metal-Test where I used to bring my race motor parts..Cranks ,rods,rod bolts etc.for Magna Flux testing. I don't know if they are still in business. I have an old set of twist barrels here. I wonder if it would be worth the money to have them test them and see what they can see. The results may prove interesting....
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"Much care is bestowed to make it what the Sportsman needs-a good gun"-Charles Parker
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