My Pro1000 was converted back to a simple turret press long ago so I am not quite sure if the progressive has enough room to load .243. If it does, the .243 takes the same shell plate and priming assembly as the .45 ACP.
I'd set the dies up to neck size only to lessen the strain on the press. Lyman makes an adapter kit to mount a powder measure in the second station. You'll have to manually operate the measure.
Frankly, the Pro1000 would not be my choice for loading rifle cartridges, but you may have to make do with what you have.
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