.223 Rem – 77gr Sierra Match King with VihtaVuori N540

The 13th installment of our Mk 262 Mod 1 clone series. VihtaVuori N540 is the primary test powder but we also shoot some groups with Accurate 2520, IMR 8208 XBR, and AR-Comp. Test bullet is the 77gr Sierra Match King with Cannelure.

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