Using a crossbow should result in accurate quick kills. If you are wounding deer then something is wrong with your shot placement or equipment selection. Patience for the broadside double lung shot is the single most important thing a bow hunter should learn. When hit through both lungs the deer expire very quickly, in seconds. Usually the deer will be be less than 60 yds from your stand. The only other shot placement that bow hunters like to use is the quartering away shot. The problem with that shot is the arrow can hit the opposite leg and bounce back in some, preventing an open exit hole for blood, thus poor trailing. This is why I like the broadside, high entrance low exit shot, no wasted meat, excellent blood trail and short expiration time for the deer. If you can't get the shot let the deer walk away and return another day, your frustrations and wounded deer will go away.