I shoot mechanicals for gobblers, so I don't adjust for them. You can pass thru a whitetail easier than a turkey because the deer's weight and stability resists the arrow's forward movement, while the lighter weight turkey will move with the arrow. I'm not saying you could never have a pass-thru on a turkey, but chances are you'll knock him down and the arrow will stay in him. Now if you're shooting at 80 lbs it may be a different story!