On the Burris, it is the same. As long as you hold down the button it will keep ranging and drop a point when the button is released. If you get a range and release the button, you have to re range for a new point if the animal is moving.Just FYI: the Garmin Xero scans continually as long as you hold the ranging button on the Pistol Grip of the Havoc or the wired remote button on the Siege or Vapor (or any other xbow, of course).
I just wanted to clear up my earlier comment about continual range. Yes, as long as you hold the button down.