The ballistic compensation information can be indexed by {HEAD ~ density altitude level} to enable {TAIL ~ adjustment} of the firearm scope to adjust for varying atmospheric conditions and range distances 
to enable
The ballistic compensation information can be indexed by { HEAD ~ density altitude level } to enable { TAIL ~ adjustment } of the firearm scope to adjust for varying atmospheric conditions and range distances
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH