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I had bad experiences with superformance powder. I tried duplicating the 75 grain load for .243 advertised on the cansiter and it fell way short of its claim. I also tried it in my .300 win mag with 180 ssts an in my .243 with 100 btsps....got up to full speed but I have one word to describe what it did....ERRATIC! We're talking an extreme spread of 200 feet per second with all loads tried. I'm glad to hear some are having success with it...I did not.
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