Dad's general rule
For hunting purposes anyway, my father's general rule always was that if you take the chance of injuring the animal instead of knowing exactly where your bullet or arrow is going to hit, then your shot is too far. Let the animal come a little closer. However, if you're plinking out at the range, why not get more accurate out to those distances.
Jesus said, "I am the WAY, the TRUTH, and the LIFE, no one comes to the Father, but by Me." (John 14:6)