............what is the difference between a turret press and a progressive?
Turret Press........
Normally, a turret press has a single station for the cartridge to be held. The dies are arranged on a turret. Like a tank's turret. The dies are already set and ready to go in the turret. So, some folks will do an entire batch (say a hundred cases) then, after a station is completed, the turret will be rotated into position for the next die station.
Recently, some mfns have "automated" the turret to switch stations as you pull the handle.........so with each pull, a new die station will come into play. It'll take several handle pulls to produce a single round of ammunition.
This automated turret does away with "batch processing." Though, the "automated" feature can be disconnected IF you wanted to.
Progressive Press.........
With a a progressive press, there are several cartridge cases on the shellplate (inline or in a rotary arrangement) with die stations above each case ready to process them. The handle is pulled and multiple cases are processed at each die station. The pulling of the handle will produce one round of ammunition with each pull of the handle.
Then, depending on the progressive machine.......it could be an automatic process that will forward the cases to the next station with the single pull of the handle or you may have to supply the manpower to move the cases to the next station.
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I never owned a turret press.
With my progressive press, I've found that when doing straight wall pistol cartridges (like 9mm, .38 special, .45 ACP) with a carbide die set.......the production of ammo can be greatly increased over a single station press.
As for a progressive machine with bottle necked cases (like .223 Rem. or .308 Win)........well, because of the way I like to do things, I will mostly use my single station press.
HTH.
Aloha, Mark