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The 300 yard zero is (finally) starting to fall out of use (ala new Army training proposals; not sure when they're supposed to be implimented, but soon). The 200 yard zero is likely a lot more relevant in modern combat, because most engagements are occuring anywhere within that 200 yard range, and a 200 yard zero provides a flatter trajectory and better chance of hits within the 200 yards than the 300 yard zero (which accounts for more of an arched trajectory).
-B
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