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    Advanced Marksmanship Grouping, what's going on with my rifle?

    I'm new here, and fairly new to long range shooting, so hello to all! I am shooting a .308, good handloads (Laupa brass, Sierra MK, CCI BR primers, IMR 8208 XBR powder), but am having issues with grouping in my rifle. I regularly clean it (removing copper), have a quality scope (Nikon...