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Notice also that to prevent any jam when unloading an unfired cartridge, the loading "window" on the left side as to be opened and that's a good choice to replace the original short extractor by a longer magnum one.

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I agree and think this is a MUST modification on the longer loaded cases. A 458win with 500's is long enough to hang up in a standard size Mauser window. I have lost the pictures of this build, but here is a "stump" picture the day Jim Gefroh picked it up. This is a Mark X in 458Lott using a SunnyHill Rigby bottom metal.