Under the following definition of "the line", the shooter has until "the BEEP" to rectify any PRE-STAGE errors, including failure to have enough proper ammo with which to engage the stage (something the T/O is supposed to look for when performing SHOOTER INVENTORY before the stage begins (REF RO1 V. 21.6 p.3) re ways to assist the shooter.) ... this would include SG ammo (as well as revolvers left on the LT).   Stage aka “the line” – synonymous with “Course of Fire” from the beep