What Zero, 10.5-inch Barrel?

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A friend had asked me to run ballistics on his 10.5" SBR. It was wondering what zero would be most effective, by shooting the flattest. In the process of running numbers, I did a quick search, and found the above picture.

These numbers have been verified through two different online ballistics calculators. Furthermore, M193 ammo will shoot with holdovers to within 1 MOA at the distances given.

As an added benefit, and as you can see, there is also a chart for common zeros using an 18" barrel. An AR-15 nerd would realize that the zeros given for the 18 inch barrel almost exactly mirror those for a 20 inch barrel, using M855 or M193 ammo. Please note, this is not always the case, especially with heavier grain ammunition.

Now, The Rifleman will search for similar pictures for other barrel lengths.


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