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A custom set of dies for your rifle may be in order, otherwise you may have a problem with your necks cracking because of reducing and over expanding the neck of a 30/06 case for a .312 bullet. Standard 30/06 dies aren't going to do what you want, you may have to neck size only. With little to no experience I hope you can find someone to give a little hands on help. It would be be better to start out with a standard caliber before you jump off into a project like your talking about. William
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