The thing about a progressive is that one step in the progression is the powder throw.
For me a big part of accuracy is consistency - putting all of those factors over which you do have control - on your side.
Unless its a very accurate piece of kit (= expensive), I would doubt that a progressive press would throw a powder measure down to 0.1gn consistently like my Lyman does.
Happy to be proven wrong - in fact I'd be interested to know what sort of consistency you get out of a progressive press.
regards ...
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