Osprey Global 50 bmg Arbor Shell was built to be used in conjuntion with the Osprey Global 223 Green Laser boresight. After you have inserted the Osprey Global 223 Green laser Boresight into the 50 BMG arbor shell then insert the shell into your barrel. The green laser will indicate your weapons point of impact. Adjust your laser or optic until it is sighted to zero.This will get you accurate but may take slight tweaks with live ammunition to get a perfect zero due to different barrel lengths, ammunition and weapons.
For details on how to use boresights check out the article:
Osprey Global Boresight [ The Original and The Best]
Associated Product:
The 50 BMG Arbor shell requires the 223/556 green laser boresight.