A light load with a bulky slow burning powder will leave unburnt granules behind to get under your extractor and bind up cylinder rotation. I recommend something fast and clean. I use 700X but not in such a light load and can't say how will it would work. Clays, Vihtavouri 310 or even Bullseye (not as clean as some of the newer powders, but FLG uses it because he says the residue is light and ashy, not gritty) might do. Around three grains. If you are using jacketed or plated bullets, work down very carefully to avoid a stuck bullet. Cast would blow out better with very light loads.
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