Any subsonic round irrespective of calibre will have the same trajectory assuming they have the same velocity. So the 22 LR is your reference for drop etc.
Shooting possums with one would possibly he only known case of using too much gun. It won't even notice it and happily sail away into the distance to land God knows where. Don't get hung up on the rainbow trajectory knowing the distance and the actual trajectory you could easily connect with and knock stuff over at 300 or more yards.
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