Gene makes a important point. Not all brass is made the same. It would be wise to sort them as to manufacture. The thickness of the case at the primer vent could effect this operation. Also as I mentioned earlier cases may not be onced fire, same length or same volume. For plinking rounds volume is not a issue. If your going for a high precision load, volume needs to be considered.
Also I think we are making this sound more complicated than it really is, especially for a person with good mechanical skills.
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