I shot a bird at 50+ last year with HeviShot Magnum Blend and he went from happy to taking a dirt nap as soon as I pulled the trigger. HeviShot #6 is certainly capable of killing birds at 60 or more yards, however, I don't think it is ethical as the chances of wounding the bird are high. The pattern you are describing is o.k. Try a box of Hevi-13 #6 and see how they work for you, you'll probably do a little better than your present load.