Measure your primer pockets and see where the primers are actually seating...

• Digital Indicator with 0.01mm/0.0005″ resolution
  • The contact point of the indicator must be removed to provide proper function.
• Gauge Body is machined from 303 stainless steel
• Small primer stem
• Large primer stem
• .223 and .308 zeroing block
• Magnum and .338 Lapua zeroing block
  • The standard gauge body is not compatible with cartridges that share the .338 Lapua case head diameter unless the diameter of the magnum step is machined to .595” to accept the larger diameter case head. This modification of the gauge body is available upon request.
  • THIS CAN BE PURCHASED HERE
• Nylon screw for securing the gauge body to the indicator
• Compatible with 300 Win. Mag case head diameter (.532”) cartridges, .308 Win. case head diameter (.473”) cartridges, and .223 Rem. case head diameter (.378”) cartridges using either large or small primers.