It’s a volume measure dropping shot that varies in size and composition. Any loader same variance in drop weights are common, depending on how the shot packs and antimony content.
Ponsness Warren round drop bushings easy to open up in a lathe. Have a 3/4 & 7/8 bushing modified to drop the volume needed AA hulls shot & wad I use. Modified bushing drops are closer to 3/4 & 7/8 than factory. Mark them with a punch prick either side of the bushing # to indicate modified.
You can do the same to square MEC bars in the 4 jaw. Easiest method use a bar that drops heavy, lined with blue painters tape to desired. I use tape to check the hull-wad-shot fill before modifying . Measurement taped bushing gives a rough indication size needed to modify the 2nd bushing that’s too small. Best open in the lathe gradually sneaking up on the correct drops . In and out of the chuck several times.
I would bush out too large with tape before opening too small using less than precise machine methods. Over drill means use a new bar. Might consider keep using the taped one. Have taped bushings, volume pistol powder measure infrequently used, that lasted well, just check the drops before each loading session.
William
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