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That Gunworks reamer, if the same one, does have a .317 dia on the neck, it also has different lead angles than normal i believe, I remember Robbie telling me about it at the time.

I found that 3...

Jim356

.317 neck on the reamer i see, was that the gunworks reamer?

You say a loaded round measues .314 neck dia, what is the dia if you move the calipers down closer to the neck shoulder...