I load Berry's 148gr DEWC on a LCT with the Autodisk Pro and was having to measure every single charge of Unique at 3.3gr. Sometimes it would be just fine for 10 rounds at a time, then drop to 1.5gr and the next one would be 4.5gr.
It was too much of a hassle and a worry, so I switched to HP38 (same as W231). Using the smallest cavity (0.30cc) it drops 3.1-3.3 grains EVERY time. I've weighed probably 100 charges and have not once seen something outside of that range.
Bullseye flakes are smaller than Unique, but it would probably still bridge at low powder charges due to the diameter of the cavity. I still have some Unique and haven't had any problems loading 45ACP at 5.2gr under 200gr LSWC, so flak powders can be very consistent as long as the cavity is large enough (0.66cc for 5.2gr Unique).
Consider switching powders for light loads and the inconsistency problem will go away.
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