The short answer is yes, the repro barrels can be altered to be extracotor. But, as Aaron asked, is your Great grandfathers gun an 0 frame 28? That would put the brakes on any possibility of using them. What, or where, specifically, did Turnbull indicate the chambers measure thin? Were the chambers lengthened? If the gun is an 0 frame, there's still a fair bit of meat in the wall at the beginning of the 'new' forcing cone. Don't roll over and play dead just yet.
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