Pellet Maximum Distance Question

Simple math... How many bird hunters die each year from large shot falling on them? Ever had #T (.22) fall on your head after shooting geese? The math says it takes 5 fpe to crack a human skull.

You're shooting squirrels in a populated area legally with an air rifle. Should your pellet hit the tree or go on a high arch to fall harmlessly to the ground? Before you pull that trigger, you had better know the chances of ricochet. 

The original question asked what the maximum range is. I gave a real-world answer. Every time I pull a trigger, I know what will happen; my freedom depends on it.