Lyman 7833003 MSR Ammo Checker Block Multi-Caliber Rifle

The Lyman 7833003 MSR Ammo Checker Block provides precision cartridge measurement and quality control for modern sporting rifles. This multi-caliber checking tool identifies dimensional inconsistencies that affect accuracy and cycling reliability before ammunition reaches the chamber.

What Makes This Different

Unlike basic case gauges that check only headspace, this MSR checker block evaluates multiple cartridge dimensions simultaneously. The precision-machined aluminum construction maintains consistent tolerances across temperature ranges. Each cavity corresponds to specific rifle cartridge specifications, eliminating guesswork in ammunition quality assessment.

Key Features

• Multi-caliber compatibility for popular MSR cartridges including .223 Rem, 5.56 NATO, .308 Win, and 6.5 Creedmoor
• CNC-machined from aircraft-grade aluminum with hard anodized finish
• Precision-ground cavities maintain SAAMI specification tolerances
• Compact 6" x 3" x 1" dimensions for portable reloading bench use
• Laser-etched caliber markings resist wear and chemical exposure
• Non-slip rubber base prevents movement during cartridge checking
• Compatible with both factory ammunition and handloads

Reloaders and precision shooters rely on this checker block to identify cartridges that exceed maximum overall length or exhibit case dimension irregularities. The tool proves essential for match preparation, where consistent ammunition performance directly impacts scores. Military and law enforcement armorers use similar blocks to verify duty ammunition meets specification requirements before issuing to personnel.

Technical Specs

• Material: 6061-T6 aluminum with Type III hard anodizing
• Dimensions: 6.0" L x 3.0" W x 1.0" H
• Weight: 8.5 ounces
• Cavity tolerance: ±0.001 inches
• Compatible cartridges: .223 Rem, 5.56 NATO, .308 Win, 6.5 Creedmoor, .300 BLK
• Temperature range: -40°F to +200°F operational
• Country of origin: United States

This checker block eliminates ammunition-related malfunctions before they occur at the range or in the field. Quality control becomes routine rather than reactive, saving both time and components. Professional reloaders consider dimensional checking non-negotiable for consistent performance.