The Sinclair Shoulder Bump Gauge Insert #30 is a precision reloading tool designed with a 30-degree angle for accurate shoulder measurement and case preparation.Sinclair Shoulder Bump Gauge Insert #3030-degree angle configurationCompatible with 25R/W/338R/6.5 Creedmoor cartridgesPrecision machined for accurate shoulder bump measurementEssential tool for consistent case preparationThis specialized insert is ideal for handloaders who demand precision in their case preparation process ensuring consistent shoulder positioning for improved accuracy and case life.