What is the logic behind diameter of 10 ring being 0.65 mm ?

All shooting sports - ISSF/ IPSC/ HFT/ Sporting Clays etc.
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tokyo2020
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What is the logic behind diameter of 10 ring being 0.65 mm ?

Post by tokyo2020 » Tue Mar 14, 2017 6:09 pm

In reference to the ISSF 10 m air rifle targets

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