SKU: 749011479
UPC: 050806111264
MPN: 09-10450
The #45a 45° Shoulder Bump Gauge Insert is a precision reloading tool designed for shooters and handloaders who demand accuracy in case preparation. This insert is specifically for verifying shoulder bump dimensions for cartridges up to .30 caliber, making it essential for ensuring consistent cartridge fit and ignition reliability.
Manufactured by Sinclair International, this 45-degree insert functions as a go/no-go reference standard, allowing reloaders to confirm that their resizing die is pushing the shoulder back the correct amount without overworking brass or creating excessive headspace. The lightweight design, weighing 0.05 lbs, is engineered with precision tolerances and integrates seamlessly into Sinclair's modular gage system.
Reloaders working with precision rifle platforms, long-range competition loads, or custom wildcat cartridges will find this insert indispensable for validating die settings. Its reliable seating and measurement repeatability make it a valuable tool for both the loading bench and field applications.
WARNING ⚠️ You must be 18 or older to purchase shotgun or rifle ammunition and 21 or older to purchase handgun ammunition and firearms. Please reference our requirements for ammunition orders to "restricted" states HERE. Always make sure you use the correct ammunition for your firearms. Ammo cannot be shipped to a PO Box. Please reference state & local laws before making a firearm or ammunition purchase.
