If a bore sight gets you asinglehit 8inches of windage and 4 inches of elevation off center it's only a matter of twistingadjustments from POA to POI wilst gawking through the optic....that if done right,WILL get you in the bull with only one shot fired.
It's then easy enough to shoot "groups" andmake fine adjustments from there..
And the gun is not "sighted in" until after the groups are fired and the fine tuning is complete.Therefore the gun is not "sighted in"with one or two shots.