I've taken a number of deer with heart shots--nearly every one dropped with-in 45 yards and in sight. Most of the lung shot deer went down with-in 100 yards or less. However, I have had a couple that were center shot double-lungers go for up to 500 yards. My broadheads are maintained in perfect razor sharp condition and penetration is near 100% on pass-thru's. Sometimes conditions and certain deer just aren't "convinced" as quickly as others.

BTW--As to the lung shot being better than a heart shot . . . a heart shot <u>has</u> to go through the lungs unless it's straight down--and even then, you'll probably clip at least one edge.