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Didn’t they have problems with bore diameter?

Wonder how hard it would be to build one on a model 70 375 or 458?

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The capstick is based on a blown out 375H&H case (basic brass), screw old barrel off, new on, especially if the donor rifle was originally a 375. ie has correct magazine follower, bolt stop correct length etc.
The tough part is getting the feed correct!
Great stopping round, tops the Lott!