Cloning MK 248 Mod 1 - Part 1 - 300 Win Mag

Cloning MK 248 Mod 1 – Part 1 – 300 Win Mag

It’s time for a new 300 Winchester Magnum reloading series. We are attempting to clone the performance of MK 248 Mod 1, a military round that uses the 220gr Sierra Match King.

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