I haven't run a MEC 600 Jr. for many years; but, as I recall, the charge bar is manually shuttled. Consequently, there's a quantum leap more tactile feedback from the 600 Jr. than the bigger progressive models. If a wad doesn't go in quite right, you'll know about it with a 600 Jr., but it might be missed with a bigger press. With the 600 Jr., you'd feel something is amiss and back-up the ram. With the big press, spilled shot might be your first sign of trouble.
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