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jplonghunter, You are correct! The 30-06 is 63mm. There is another reason for all of the new cartridges. Someone thinks they can make the old bullet go a little faster with a new case of a different shape or higher pressure (which does work). A friend used to give me heck for all of the old cartridges I lked to try. He said "why do you try all of those old cartridges when we found out long ago these new ones were better". I told him I didn't get a chance to find out for myself.
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