Is a progressive loader for loading multiple cases at a sitting, while a single stage only does one round at a time start to finish?
A progressive loader has multiple stations, performs a different successive step on the cartridge at each one, and produces a loaded round with each pull of the handle after every stage is set up and adjusted.
A single stage press is normally used in batch process. Resize and decap a number of cases, then reprime all of them on or off the press, then powder charge all of them off the press, then seat a bullet in each. With minor operations and inspections between major steps.
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