https://thenewrifleman.com/maximum-bullet-flight-getting-the-most-out-of-ar15-zero/
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Western Rifle Shooters Association
"This is a very important lesson. You must never confuse faith that you will prevail in the end—which you can never afford to lose—with the discipline to confront the most brutal facts of your current reality, whatever they might be.” – VADM James Stockdale, USN