Based on my own experiences with custom dies, I would recommend Whidden. FF the brass, then neck size and shoot it 3 more times to get it well blown out, then send 3 pcs to Whidden with the sized dimensions you expect (Kevin can help you with that) and have them make you a FLS die. If you are only going to use one lot of brass, you might consider a non-bushing die, otherwise I think that the bushing style is the best/most versatile. That should be a fun rifle if you can get it to shoot well.
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