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Good post. Has me thinking back a few years. I am not sure what to say. I can remember a .50 barrel I checked with an erosion gage (A round tapered pin you stick in the breech end with rings cut in at intervals to check bore erosion) and it dropped all the way through the barrel and actually stuck out the other end a little bit. This was with a knurled section on the pin used as the handle. My point is : How could the chamber section (The neck area) get that worn with live rounds? I might add that this was an early barrel with out the stellite liner. I have seen various machine gun barrels with large chunks of rifling missing, but never one like that. Maybe there is something to the blank thing.
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