I've been loading 8-9 grains of unique under a 255 SWC for several years. I've tested 8-9 grains of power pistol under the same bullet. Velocities are very close (8.0 = 860, 9.0 = 950) with both loads. I'm thinking that when I use up this batch of Unique that I'll change over to Power Pistol simply because it gives me less variance when dispensed from my RCBS Uniflow.
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All that is neccessary for evil to triumph is for good men to do nothing.
Edmund Burke
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