The repeatability of a dipper is similar to that of a powder measure if used properly; sometimes better. The adjustability is not. There are situations in which a dipper is preferred—small charges in particular. Try, for example, finding a powder measure precise enough for charging .25 ACP cases. These little guys often need lower charge weights and tighter repeatability than the average measure is capable of. Even .32 ACP and .32 S&W can actually be easier to charge with scoops.
There are also situations, such as loading at the range to use the same cases over and over, where it can sometimes be easier to carry a few known scoops than a measure. Scales are always problematic outdoors because of the breeze.
Finally, people develop different ways of working that they prefer. There sometimes is no explanation and doesn't need to be.
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Last edited by Unclenick; December 16, 2012 at 12:06 PM.