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223 neck thickness
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  1. The Ammo & Reloading Forum
    For 223 Im using a 248 od bushing while bump sizing to size the neck, ream the id at 224, and then resize the neck to 244 od. This yields a constant 12 mils brass neck thickness and takes out the uneven thickness in the neck. Then I end up with about 1 to 2 mills of neck tension depending on...
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