One thing to consider when target practicing with you're bow. Most all targets have either deer vitals or larger circles to aim at.

No matter if your target is a bag or a block style target one thing you can do is place a orange sticker or target dot within that larger circle to help you key in a little tighter to that target.

On an older target you place a pieces of black tape, either duct tape or Gorilla tape over a section of the target and then place the orange dot to help you get dialed in and to help get your groupings a little more tighter.