Thanks, PawPaw. I did try adjusting the tension screw. Didn't seem to make any difference. Since I posted my first message, I emptied the hopper, wiped it out and then tried some IMR 4895, which is a very coarse powder (compared to WSF, which is pretty fine). Again, over about 40 throws, the weigh varied by as much as a grain.
I may try the disassembly you recommend.
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NRA Member. Proud to own: Kahr CM9 -- Springfield XD 45 -- Ruger 10/22 Takedown -- 1925 Mosin Nagant 91/30 -- 1944 Mosin Nagant M44 -- Kel Tec Sub 2000 (9mm) -- Western Field EMN 176 bolt-action 20 gauge
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