Stop Wasting Match Ammo: the Boresight Alignment Shortcut Every Shooter Needs

Breaking down the facts behind Stop Wasting Match Ammo: the Boresight Alignment Shortcut Every Shooter Needs—check out the essential highlights.

Shooters today lean toward two primary alignment mechanisms: cartridge-shaped units that chamber directly into the barrel, and external devices attached to the muzzle crown. A chamber cartridge arbor seats like a standard brass casing directly against the chamber shoulder. This design mirrors true chambering geometry and projects light straight through the rifling.

The limitation of chamber cartridges lies in caliber specificity. A .308 Winchester cartridge arbor will not fit a 6.5 Creedmoor or 5.56 NATO chamber without dedicated adapters. By contrast, a muzzle insert collimator uses expanding brass or polymer arbors slipped directly into the muzzle end. These tools accommodate multiple calibers ranging from .177 up to .50 caliber, though their accuracy depends on user care during insertion.

If you choose a muzzle device, the arbor must sit dead-flush against the crown without tilting. A microscopic tilt at the muzzle produces several inches of lateral deviation at 25 yards. Both approaches work, but understanding their operational limits prevents you from chasing ghost zero errors across your targets.