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There is a plethora of ballistic calculators you can find online or your mobile phone, just plug the data you have in them and you can see bullet drop and velocity at whatever range you fancy.
2 of the first hits : | Ballistic Trajectory Calculator
Ballistic Calculator

It looks like that at 600 yards the bullet may or may not be supersonic, you didn't list it so I can't say.
Going subsonic is not just bad for bullet drop, but it ruins accuracy. You have to stay above speed of sound or below it for the entire flight for the best accuracy.
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