Here is a picture of the massive sliding sleeve micrometer die I had to build for this. Quite happy with the results, consistently getting .001-.0015" runout with CEB bullets using this. There is a standard 338 Edge on the left for comparison. Trying to test and get info out as soon as possible for you guys following this.
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If it is 1 inch, what press do you use? I have a rockchucker and it is 7/8 or 1 1/4 with the adapter removed for the 338-408