I bought a new Parker Thunder Hawk and shot arrows with 100 grain field points out to 50 yards and they were right on the money. I shot them with 100 grain slick tricks and they went to the left a couple of inches at 20 yards and almost a foot at 50 yards. I went back to the shop where I bought it and was told to move the scope to zero in the broad heads. Is this my only option or should I try expanable heads? I am new to cross bows and will welcome some advice.
Thank you