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There was an article in Guns and Ammo magazine a looooong time ago that detailed the conversion of a #1 to .470NE; apparently once you get to that size of cartridge there are a few more modifications needed than just a barrel and an extractor, simply due to the physical size of the loaded cartridge. By-passing that and going to an even bigger .500+ caliber NE cartridge, IIRC, was an even more complicated procedure. Anybody done one of these?