Abstract: Known “good” reference lines are provided for scope leveling using a reference device support platform attached to a rifle such that the reference device support platform first surface is parallel to rifle's horizontal bore center line and perpendicular to rifle's vertical bore center line. An alignment reference device, such as a laser leveling device, is then placed on the reference device support platform. When the alignment reference device is so placed, a horizontal axis of the alignment reference device will be parallel to the rifle's horizontal bore center line and a vertical axis of the alignment reference device will be perpendicular to the rifle's horizontal bore center line. Consequently, when vertical and/or horizontal reference lines are generated by the alignment reference device they are known “good” reference lines to be lined up with the scope's stadia lines.