Yes, EHF, it depends on many factors. I like to limit myself to 35yds on a relaxed whitetail, if he's standing in the open looking the other way. I can group in about 5" there in a hunting situation. I work backward from there, depending on the situation. For example, a walking deer, no farther than 15yds, on an alert deer, about 20yds. After a year or two, you'll be well aware of your limitations, the trick is to not try and stretch your limits in the meantime, and know you wounded and lost an animal because of this.