200 yard aiming black size equivalent for indoor practice

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How big should I make the black "Dot" to equal the 200 yard aiming black in NRA Highpower targets so I can get the equivalent size at say 10 ft or 20 ft indoor just for offhand practice..?


If you know the reduction formula that would be great to have for figuring the 300 and 600 also.

Math majors needed!

 

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Full Size Target Size)/(Distance to Full Size Target) X (New Distance to Target) = (Reduced Target Size)

Just make sure everything is in the same units (inches is probably easiest) and you don't need to mess with tangents and what not...any simple calculator will work.

So for the example above you end up with

(13 inches)/(7200 inches) X (240 inches) = 0.4333 inches.

Found this on another site
Hope this helps