Dippers are simply a set of various sized scoops. What they throw is variable. it takes a bit of a "knack" to get any continuity. DEFINITELY don't use them for max or even near max loadings!!!
Trying to load with a measure you cannot trust is not the smartest thing a reloader could do. I recommend a better made powder measure. Lyman #55, RCBS uniflo are two good ones! A dump style try the Lil Dandy from RCBS.
CW