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That sounds like how I adjusted my bullet seating die: took a factory loaded cartridge, ran it all the way up with the ram, them screwed the seating die down until it touched, and make fine adjustments until the OAL on the reload was the same as the factory cartridge.
The +0.003 diameter I referenced is as measured on cases after they have been primed but before powder and bullet seating. I think the problem is somewhere earlier in the process, like during the depriming/sizing step....
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