Belief: “The time Iput five shots into a cloverleaf is the time I did everything right.”
Fact: This is thegreatest misunderstanding in the world of accuracy and
shooting. In our testing, no matter the
ammunition used, the weapon showed thatthere was a natural fluctuation in regard to group size and point of impact.This has been determined by other studies as well, even those using ‘rail guns’and heavy bench rest rifles. Accuracy, at least in our testing, was determinedto be more akin to a ‘cone’ than a grid in that the accuracy of the
rifle had an average maximum radialspread of .765 MOA over all barrel lengths.
In layman’s terms,this means that the barrel could fire an indefinite number of
rounds into a circle with an averagediameter of 1.53 MOA, which is not all that impressive. However, it must beunderstood that accuracy does not work like traditional manuals dictate. As anexample, a man takes his new
rifle to the range. He
sets up his targets and fires severalfive shot groups. His groups are respectable by most standards, with mostclustering at around .75 MOA. He
sets his zero and continues to fire.
Here is the importantpart: he fires another group and gets a ‘flier’ one MOA low and left. He discardsit and continues, discarding all the fliers he gets. Now it gets hard for himto figure out. He shoots five shots and notices that he gets a .25 MOA group,but .8 MOA low and .45 MOA right. This is a great group, and he scratches hishead and adjusts his
scope to it. He shoots again, but printsa wide group measuring 1.2 MOA across, but now shifted off his zero. He assumesthat he has run his luck out,
packs up, and goes home.
What has happened herehas happened to many people. What our friend did not realize was that his
gun was never zeroed at all. The tightcluster he got was not the time he did it right, it was a statisticalpossibility that comes from firing. In reality, the man had a
rifle that was not shooting .75 MOA, butrather he was printing groups and ignoring his most important ally, his fliers.These are critical to
rifle accuracy and are
notmistakes.
Statisticallyspeaking, the rifle he has may actually fire a maximum group size of 2 MOA at100 yards, which sounds terrible, but really isn’t. The vast majority ofhis
rounds willprobably impact at a radius of around .5 MOA of his true zero, or even less ifhe has a good combination. What he did not understand was that there is nothingwrong with a rifle that may throw a
round out even 1 MOA or more, it’s allwithin the statistical level of accuracy that the rifle is capable of.
The results of thisstudy were very telling. Overall, as demonstrated in the accuracy charts, theshortest barrel length provided the most consistent accuracy across the boardand the longest length proved to be the least accurate with the same loads. Thedata also shows that the so called “MOA” a rifle can shoot changes with distance.The groups at 100 yards show very good, often bench rest grade accuracy, andthen at extended ranges, they show a natural increase in group size. Across theboard, all the loads tested across all barrel lengths showed this. Across allloads and lengths, the average at 900yds was .765 radial MOA or 1.53MOA.Compare this to the 100yd average of .206 radial MOA or 0.413MOA. That’s right:the average across all lengths and loads yields sub half-MOA at 100yds and justover 1.5MOA at 900yds.
发表于 2018-1-9 21:41
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