A user can utilize {HEAD ~ the ballistic compensation information} to compensate for {TAIL ~ various density altitude levels} to adjust the firearm scope 
A user can utilize { HEAD ~ the ballistic compensation information } to compensate for { TAIL ~ various density altitude levels } to adjust the firearm scope
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH