Not sure where some are getting their training but we have seen first hand how shooters start out at 100 and create unsafe rounds leaving the range because of their mal adjustments. FWI worth, I use the Sweet Spot (SAAMI) Factory round for the caliber and make my adjustments with 2 rounds at 15 yards and put the third usually within an inch of the paster at 100 yrds. I admit sometimes I need a 4th rd if I over adjust. Not sure if this will work with sub standard scopes and mounts as I only use Leupold.
I didn't read far enough ahead.
Bore sighting lets me get beyond 15 yards to rough in the scope.