"what is it.."
As I understand it, the baffle is used to mitigate the effects of the weight of column of powder in the measure. Some powders will experience a difference in the amount of powder thrown as the height of the column of powder is reduced in the measure. A baffle serves to support the weight.
An alternate approach is to place a weight on top of the powder; such as, some washers or a piece of shaft.
Simple solutions are filling the measure more frequently or using a powder which isn't sensitive to weight variations. In my limited experience, the consistency I get with ball and stick powder is good enough to skip the baffle; however, it’s the flakes that get flakey and need a little help.
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A lack of planning on your part does not necessarily constitute an emergency on my part.
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