Re: bullet run-out
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My guess is that your neck run-out is being introduced by the sizing die or sizing operation. Check the neck run-out on fired cases and then again after every step of your reloading process. This will tell you where the problems originates.
Once you determine what is causing the problem, fixing it will be easier.
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I would go through these steps and also measure the neck of the fired case, sized case, and sized case with a seated bullet. Over sizing caused me the same problem. I light size the body to set the shoulder then do the neck with a bushing just enough to get the tension I want.