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Thread: turning magnum rims

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    Default turning magnum rims

    Hey all, does anybody have experience turning a magnum rim down to .472" I'm sure you see where I'm going with this one...Is there a cutter available similar to a neck turning set up?

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    Member Alangaq's Avatar
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    Never seen any kind of neck turning set up that would work, but you sure could chuck them in a small lathe and take the rim off with a standard cutter.
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    Member Big Al's Avatar
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    Quote Originally Posted by 358wsm View Post
    Hey all, does anybody have experience turning a magnum rim down to .472" I'm sure you see where I'm going with this one...Is there a cutter available similar to a neck turning set up?

    Yes, I've cut a lot of them using a collete attachment on the lathe. You just grind your cutter to suite. Or you can make a form tool for your cutter. It takes longer to put the case in the collete holder and take it out than it does to to remove the belt.

    It's not much of a trick. Having a collete attachment for your lathe maybe the real trick.
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    Moderator Paul H's Avatar
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    I've cut them down for my 350 rigby. I use a small lathe, and it's a very time consuming process. If there was good commercial brass available, I'd buy it. Turning down the rim, cutting off the belt and deepening the extractor groove is very time consuming.

    Trust me you don't want to pick or build a wildcat that requires such brass. You can pick any power level and case capacity you can imagine with current available brass. You'll be much, much, much happier shooting a gun with available brass.

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    Member Big Al's Avatar
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    Quote Originally Posted by Paul H View Post
    I've cut them down for my 350 rigby. I use a small lathe, and it's a very time consuming process. If there was good commercial brass available, I'd buy it. Turning down the rim, cutting off the belt and deepening the extractor groove is very time consuming.

    Trust me you don't want to pick or build a wildcat that requires such brass. You can pick any power level and case capacity you can imagine with current available brass. You'll be much, much, much happier shooting a gun with available brass.

    Paul, make a form tool or have one ground for you. It will cost you some money to have one commercial ground. Have them do it for you out of 10% cobalt, you'll never need to resharpen. With a form tool, it's only and plunge cut and a back out.
    "The tree of liberty must be refreshed from time to time with the blood of patriots and tryants." (Thomas Jefferson

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