Sinclair bump gauge inserts are designed to measure the shoulder bump when configuring full-length sizing dies. These bump gauges can be installed in either of our comparator bodies and are precisely machined to accommodate specific shoulder angles of cartridges. Instead of measuring to the datum line, these gauges provide a more accurate and easily accessible measurement by referencing the shoulder of the case, allowing you to determine the exact amount of sizing applied to your cases. It is generally recommended to achieve a bump of 0.001 inches - 0.002 inches for bolt-action rifles and 0.003 inches - 0.005 inches for AR-15 type rifles. Additionally, this tool is useful for organizing your brass and loaded ammunition, especially if you own multiple rifles chambered for the same cartridge and for verifying loaded ammunition.

Report incorrect product description

Reviews

Q & A

Retail Stock

Compliance

Shipping Restrictions

It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

WARNING: Handling firearms or firearms parts can expose you to lead and other petroleum products known to the State of California to cause cancer, birth defects, or other reproductive harm. Wash hands thoroughly after handling. For more information go to www.p65warnings.ca.gov (CA Health and Safety Code Section 25249.6).