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Gunsmithing how to turn .243 brass into .260

Re: how to turn .243 brass into .260

you simply need an expander die. you can buy them at sinclair or midway. the mandrel you'll want from sinclair will say E26

and then you put the die in your press and run the 243win case into it and when you pull it out, it will have expanded the neck to 260, which is the only difference