If you are reloading on a progressive then it makes sense, especially to check for no powder. But in .223 many of the powders will nearly fill the case. Varget for instance pretty much goes above the shoulder and nearly to the case mouth on most loads. I can't think of a powder that would NOT overflow on a double charge in .223, so that would be obvious.
The concern would be no powder and a possible squib. With most powders it would be full enough to easily see on a single stage or turret press. But on a progressive you probably want one so as to slow down for inspection of powder.
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