simple calculations

2.4 inches at 67 yards. Your math was correct.

When using mills, I think in terms of 1000s of inches for the range. 100 yards is 3600 inches. Move the decimal three places and you have 3.6" At your range of 67 yards, multiply by 36 gives you the range in inches = 2412 inches. Therefore, one mill is 2.412 inches. 

It is a lot easier start using meters for your ranges instead when using mils. 100 meters works out to 100 mm or 10 Cm. Your 61 meters (67 yards rounded) is 61mm or 6.1 cm. 

Thanks Irons. That's a very smart and useful formula. +1 for you!

I_Like_Irons
It is a lot easier start using meters for your ranges instead when using mils. 100 meters works out to 100 mm or 10 Cm. Your 61 meters (67 yards rounded) is 61mm or 6.1 cm.

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Imperial units are inferior units. LOL

Imperial units are inferior units. LOL

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Not really.

If we are talking of METRIC mildots, it has been designed around the metric system, so fits better with metric than imperial.

Like in every area of measurement we have to be careful to define the units... do you know the 'mil' unit of the particular scope? Happily at the short distance air guns are used at the difference is so small as not to make a significant difference.