The GMB case roller is a machine that restores proper case diameter by removing the bulge from cases, while also resizing the rim of the case for optimal performance. Additionally, the machine is designed to consistently resize the cases with less stress on the brass, promoting longer case life and improved accuracy.

The GMB case roller is a machine that restores the proper case diameter by removing the bulge from cases while also resizing the rim of the case for optimal performance. The process is called rollsizing or roll-sizing, and shooters and reloaders refer to the machines as a case roller, roll sizer, or rollsizer.