8.0 grains of Herco would do it, but that's not a light load! 7.5 grains of Unique would be about equivalent -- so try about 6.5 grains of Unique and work your way *down*.
You're going to have trouble getting the velocity down to 1000. It's an efficient little cartridge.
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"Everything they do is so dramatic and flamboyant. It just makes me want to set myself on fire!" —Lucille Bluth
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