I have gone through about a pound of it recently. It's a very fine grain powder and I thought there would be some leakage on a MEC single stage. With the MEC brass washer under the rubber grommet and the powder bottle screwed on very tight I haven't experienced much leakage at all. For 7/8 12ga loads the Claybuster grey wad gives good crimps in the Winchester AAHS hull. In the older AA Compression Formed hulls I have to use the Claybuster 3/4 ounce wad for a proper crimp. I am using a #16 MEC bushing and it's throwing 14.7 grains of PP.
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