One thing I've found with milspec/milsurp ammo is that when fired from different types of rifles, the results can be highly variable. For example, I tried using some German 7.62 NATO to sight in a Howa bolt gun. It patterned badly. Same stuff in a FAL is typical 3-4 MOA, but in a converted Chilean 1912 Mauser, the stuff is laser accurate.

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