Gun Convergence Setting

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The convergence slider is set at 10m increments with no ability to set the convergence in between those values.

 

This prevents me from setting the convergence to 300 yds/274m (300yds=900ft=274.32m to be exact) yet I can set the Gyro Gun sight to 300 yds in the US planes.

 

Is there a configuration setting I can edit to set the gun convergence manually to 300yds/274m?

 

As it is now I have to choose between 270m or 280m convergence.