Yes there is, the distance is about 9~10 (Units), about twice as far as the gun, with Xbow being in the middle.
You'll get messages saying if your in a decent position
Hits Squarely means your not quite on the sweet spot, Strikes True means your on the sweet spot
though if you hit a crit hit, then these messages wont appear - and its a standard ranged attack message if your out of the sweet spot entirely
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