Quick Answer
Use a 300 Blackout laser boresight to align your optic with the bore before live fire. Insert it into the chamber, adjust your optic to the laser dot, and confirm at distance.
Why Boresight Before Zeroing
Boresighting gets you on paper quickly, saving ammo and time at the range. A laser boresight for 300 Blackout projects a visible dot that shows exactly where the barrel points. This is especially useful for 300 BLK because subsonic and supersonic loads have different trajectories, but boresighting only aligns the bore to the optic—it doesn't replace final zeroing with live fire.
One tradeoff: laser boresights are most effective indoors or in low light. In bright daylight, the dot can be hard to see at 50 yards or more. Plan to boresight in a shaded area or during overcast conditions.
Step-by-Step: Boresight Your 300 Blackout
- Ensure the rifle is unloaded: Remove the magazine, lock the bolt open, and visually and physically confirm the chamber is empty. This is non-negotiable before inserting any tool. Always treat the rifle as loaded until you've verified it yourself.
- Insert the laser boresight into the chamber: With the bolt locked open, insert the 300 Blackout laser boresight (7.62x35mm) into the chamber, then release the bolt gently so it holds the boresight in place. Do not force it—if it doesn't seat, check for debris. The boresight should sit snugly; if it rattles, reseat it.
- Set up a target at 25 yards: Place a target 25 yards away. This is a good starting distance for 300 Blackout because it's manageable indoors and gives a clear laser dot. Make sure the rifle is stable on a rest or sandbag. Use a stable rest to avoid shifting the rifle while adjusting.
- Turn on the laser and note the dot: Activate the boresight (usually by twisting the rear cap). The laser will project a red dot on the target. This dot shows where the barrel is pointing, not where the optic is aimed. If you don't see the dot, check the battery and alignment.
- Adjust your optic to the laser dot: Without moving the rifle, adjust your scope or red dot's windage and elevation knobs until the reticle or dot sits exactly on the laser dot. Make small adjustments and recheck. Move the optic's point of aim to the laser dot, not the other way around.
- Remove the boresight and confirm with live fire: Turn off the laser, remove the boresight, and chamber a round. Fire a three-shot group at 25 yards. Adjust your optic based on where the group lands relative to your point of aim, then confirm at your desired zero distance (e.g., 50 or 100 yards). Boresighting is only a starting point; always confirm with live ammo.
Product Facts
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TPO 300BLK 300 Blackout Laser Boresight 7.62x35mm: The TPO 300BLK laser boresight emits a Class IIIa laser (less than 5mW) with a wavelength of 625-650nm and a sighting range of 15-100 yards. This gives you a visible red dot for bore alignment at typical zeroing distances, and the aluminum body fits securely in the chamber.
TPO 300BLK 300 Blackout Laser Boresight 7.62x35mm
