When the Elburg version first came out i had a right wing fletcher and we killed a number of deer with them. Then i got tired of nicking my finger with the right wing feather and got a a left hand fletcher and we killed a number of deer using them the wrong way, not any noticeable difference. Then one day i thought it would be nice if the arrow and the head agreed with each other, I was thinking about arrow flight, not how deadly the head would be so we made a bunch of Hill left wings from blanks. They flew beautifully and we seemed to be getting more blood on the ground. But then my wife shot a wrong way old arrow diagonally through a deer with a 38 at 26" recurve and 430 grain arrow, from rear hip all the way to the front far side shoulder and buried the head in the far side scapula. No exit wound and still plenty of blood on the ground which proved that perhaps the difference was still not that big of a deal.