Quote:
the only thing that should touch the inside of a sized case neck before the bullet goes in is a charge of powder and air
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That's the kicker. I think you should clean the brass, lube, then size. Once that's all done clean the lube (and anything else) off then load.
A lot of times with my bolt gun brass I do not need to clean before I size. Just lube then trim/chamfer if needed.