The RCBS Carbide 3-Die Roll Crimp Set for .41 Remington Magnum (Model: 18512) is a specialized, high-precision reloading tool designed for straight-wall handgun cartridges. Built from proprietary die steel, this Group B die set streamlines the reloading process into three distinct steps to produce consistent, high-performance ammunition. It features a diamond-lapped tungsten-carbide sizing ring inside the sizing die, which resizes brass to factory specifications without requiring case lubrication, preventing stuck cases and saving preparation time.

Key Features

• Carbide Sizing Die: Resizes fired brass cases back to original factory dimensions and removes spent primers in a single operation without the need for case lube.
• Expander Die: Properly expands the mouth of the straight-wall case to the correct internal diameter while adding a slight flare to allow smooth bullet seating.
• Seater/Crimp Die: Accurately seats the projectile to the desired depth and applies a robust roll crimp to secure the bullet.
• Standard Threading: Manufactured with the industry-standard 7/8"-14 thread pattern, ensuring compatibility with most standard single-stage and progressive reloading presses.

Product Specifications

• Brand: RCBS
• Model Number (MPN): 18512 (or R18512)
• Die Group: Group B
• Cartridge Compatibility: .41 Remington Magnum (.41 Calibre)
• Die Thread Size: 7/8"-14 thread
• Crimp Type: Roll crimp
• Material: Proprietary die steel with a tungsten-carbide insert
• Required Accessory: Shellholder (sold separately)

Who is the Rcbs 41 Mag 3 Die Carbide Set for?

• Revolver handloaders — who require ammunition for heavy-recoil firearms chambered in .41 Remington Magnum, as this RCBS 41 Mag 3 Die Carbide Set applies a secure roll crimp to keep bullets firmly seated in their cannelures under heavy recoil when loaded using standard 7/8"-14 thread presses.
• High-volume reloaders — who want to process straight-wall brass without the step of applying case lubrication, utilizing this carbide 3-die reload set with its integrated tungsten-carbide sizing ring to speed up the reloading cycle on standard 7/8"-14 thread presses.

Less suitable for: Reloaders processing bottlenecked rifle cartridges or semi-automatic pistol cartridges; this product utilizes a roll crimp engineered specifically for rimmed, straight-wall .41 Remington Magnum cartridges, meaning bottlenecked cartridges require a specialized 2-die set and semi-automatic cartridges require a taper crimp die instead to headspace correctly on the case mouth. Additionally, it requires a compatible shellholder which is sold separately.