Not sure about your xbow and scope. But I have an Excalibur Matrix 355 with a Hawke scope and at 40yrds in I dont shoot at the same bullseye after the first shot. I have pegged a couple of arrow or bolts (if you choose). I have mine zeroed in 10yrds out to 60, but where I hunt realistic shots are 10-40yrds, most shots have been at 20-25 yrds.
ETA: Grouping with my xbow is an inch or better at 40yrds off a bench. Since I use a primo shooting stick I usually shoot off that for practice. I still dont shoot the same bull after the first shot.