Standalone precision. No housing required.
Measure what matters. Bullet tips can vary, making them a poor reference for consistent seating-depth measurements. The Sigma8 Bullet Comparator measures from the bullet’s ogive—the point that matters when determining cartridge base-to-ogive measurements.
Each comparator is a complete, one-piece tool machined from passivated 416 stainless steel. Use it directly on your caliper or pair it with the optional Sigma8 adapter for a fixed setup.
Available in 10 calibers from .224 through .375. Buy only the caliber you need—no housing, starter kit, or brand lock-in.