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Sunday, December 2, 2012

Part 3, so what MOA is a 10 value in a 10m Air Rifle bullseye?

This question I have asked myself a few times.

The size of the center dot is .5mm.  But, your pellet is 4.5mm in diameter.  To avoid splitting hairs or millimeters as is the case here, assume one must hold and execute a shot in a 4mm area using a "center to center" method of measurement.

Let's try the non calculator, non 2(Pi)r reasoning approach first.  Quick math tells you if you have to hold 4mm at 10 meters for a 10x, you have to hold 40mm at 100 meters as it is 10 times the distance.  40mm is 4cm or just a tad over 1.5".  Translation?  If you can score a 10 routinely in 10m Air Rifle, than your hold is equal to 1.5" at 100 meters which is more than adequate to take a smallbore ram.  But what does that mean at 40, 60 or 77 meters?  Here is where MOA brings value to the analytic shooter and lets you compare and contrast your ability at different distances, even 10m air rifle.



The worksheet above gives you the values of the various scoring rings from an MOA hold perspective.  If you are able to shoot an 8 or better each shot, your hold then is a 5 MOA hold.  But, is that good enough for a smallbore turkey?  Until now we have been working in friendly geometric shapes.  Silhouette animals are hardly equivalent to a bullseye. Using the link for PDF targets on my blog, you can look at a turkey with an MOA grid overlay.  Decide for yourself if a 5 MOA hold will work for you all of the time or some of the time.  Would a 3.3 MOA hold work?

In closing, you really have to have a fairly steady 9 hold or better for Turkeys.  Yet an 8 hold for Pig will work.  It is also interesting to see how accurate my quick math was were I estimated a 10 dot hold at 10 meters was worth a 1.5" at 100 meters.  Hopefully this will begin to come together for you so you can use it as a training tool to better understand your results. I think this will be the end of the MOA series.  If anyone thinks of a way to improve the utility of the material put forth, I am all ears.  I have no formal marksmanship training and all of this is from my own personal quest to understand what I need to do to improve.

PRACTICE not MATH I suspect is the answer!  I am hardly holding the 8 ring and I need to improve that!!

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