There are shotgun reloading benches, as debaser provides, but the level of automation you're demanding will run WAY past tens of thousands of dollars. You're not likely to find that level of quality control at a shell manufacturing plant.
You could buy a lifetime supply of shotgun shells for how much that machine would probably cost.
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It would probably be cheapest to get a regular reloading bench and then pay someone to make the shells for you if you can't be bothered.
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Simple Machines in Higher Dimensions
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