Mk 262 Cloning - pt 2 - Sierra vs Nosler with AA2520

We are on a quest to duplicate or clone the Mk 262 Mod 1, also known as Black Hills 5.56 77gr OTM. Today we test our first powder of the series, Accurate 2520.
UPDATED 09/27/2018 - All links have been removed to comply with TH-cam content policies.
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