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Most posts online that I've seen for the 175gr SMK/Reloader-15 combo state accuracy nodes between 41 grains and 43.5 grains of powder. Keep in mind that these users were using different primers, brass, and powder lots. So as always, start low and work up. I'd probably start with 40.8 grains and do .2 grain increments to find my sweet spot. Let us know what works best for you.
 
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