The Sinclair Shoulder Bump Gauge Insert #30A is a precision reloading tool designed with a 30-degree angle for accurate shoulder measurement of specific cartridge cases.Sinclair Shoulder Bump Gauge Insert Model #30A30-degree angle specificationCompatible with 300 SAUM 7MM and 338 caliber cartridgesPrecision machined for accurate shoulder bump measurementsSKU: 749011481 UPC: 050806111288Essential for handloaders and reloading enthusiasts who need precise case shoulder measurements to ensure proper cartridge headspace and consistent ammunition performance.