The Sinclair Shoulder Bump Gauge Insert #28 is a precision reloading tool designed with a 28-degree angle for accurate shoulder measurement of popular rifle cartridges.Sinclair Shoulder Bump Gauge Insert #2828-degree angle specificationCompatible with 22-250 223 and 243 calibersPrecision-machined for accurate case shoulder measurementEssential tool for consistent cartridge reloadingThis insert is an essential component for reloaders who demand precision in measuring cartridge case shoulder position to ensure consistent chambering and optimal accuracy in their rifles.