This is a new PTG (Pacific Tool & Gauge) Solid Pilot Chamber Finish Reamer, specifically designed for the 280 Ackley Improved cartridge with a 40-degree shoulder. It is a specialized gunsmithing tool used for the final, precise finishing of a chamber after the basic reaming process. Free shipping is available for this item. This reamer is intended for experienced handloaders or gunsmiths seeking to achieve a custom, precise chamber fit for improved accuracy and performance with the 280 AI cartridge. As a precision tool, its use requires knowledge and skill. Check the listing for full details on the specific pilot size and any other technical specifications. PTG Solid Pilot Chamber Finish Reamer 280 Ackley Improved 40-Degree Shoulder. Condition: New. Listed at 151.70 USD. They feature a solid pilot and a 3/8" square drive shank for use with a tap wrench. Right hand cut.