Barrett MRAD and multiple cartridges

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    Blacksmith101

    Grumpy Old Man
    Jun 22, 2012
    22,267
    TYPO

    E.Shell said:
    1) MRAD: SNIP......

    2) MOA: A Minute of Angle is also a standard unit of angular measure and is called "Minute" or an "M.O.A.". It is NOT a Moa (mow`ah), which is a very large extinct, flightless, carnivorous bird having nothing to do with geometry.

    If we divide a circle's circumference by 360, we arrive at one degree. If we then divide this degree into 60 sections, we will have one minute of angle.

    The arc length of one minute of angle is 1.047" at 100 yards. At 1,000 yards, one minute of angle is 10.47" and a reasonable approximation is to think of it as one inch per hundred yards (6" at 600, 8" as 800, etc..).

    Scopes using the MOA system of adjustment usually use 1/4 MOA clicks, so at 100 yards, one click is (2.6") [should be 0.26"] (1.047" / 4 = .26175"). At 1,000 yards, one click is 2.6".

    If a milradian based scope adjusts 3.6" per click at 1,000 yards and the minute of angle based scope adjusts 2.6" per click at 1,000 yards, it is obvious that there is almost no difference in the values provided by each system. 1" at 1,000 yards is invisible to the average shooter. One system is no better than the other.
    ........SNIP
    Click to expand...

    Thank you for a great explanation. I noticed the typo when I printed it out to share with others.:thumbsup:
     
    MigraineMan

    MigraineMan

    Defenestration Specialist
    Jun 9, 2011
    19,242
    Frederick County
    Barrett MRAD (aka "MK-22 Precision Sniper Rifle (PSR)") recently underwent air-drop testing at Ft. Bragg.
     

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