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The version I heard was that the "gunsmith" tried to get the .30-'06 reamer into the 6.5 barrel and when it wouldn't go in all the way, he ground down the pilot. The result was that a .30-'06 cartridge could enter the chamber and be fired.
Actually, that is not too surprising. At those pressures, a lead core bullet will act almost like silly putty, deforming to accommodate itself to the barrel as necessary and without raising pressures greatly.
Jim
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