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back in the 1970s it was the only way to get brass other than new ammo

any easier way is to use a table saw with a fine tooth carbide tooth blade and a rip fence , you would need to make a clam shell stile jig out of wood it will hold 10-15 pieces of brass in the same way we all made 300 Blackout brass out of 5.56 brass you can ruff trim 75-100 + pieces an hour then you can fine trim to length and ream if necessary