Pistol vs rifle powder metering drum? If I'm using a rifle drum for less than 10 gn charges, I see that kind of fluctuation. Change to pistol drum and those low charges become very consistent. Just a thought.
For sale is a CZ 50 chambered in .32 Auto. In pretty good condition. Typical surplus wear. Fun little shooter! Monroe or surrounding counties. $400. This one is in my C&R logbook. Bonus box of .32 now included!