RCBS Cowboy Bullet Mould - Double Cavity .401" 180 gr

The RCBS Cowboy Bullet Mould - Double Cavity .401" 180 gr is a precision-engineered casting tool designed for reloaders who demand accuracy and durability in handloaded ammunition production. Built from solid cast iron and precision ground square, this double cavity mould delivers consistent bullet geometry across thousands of castings—essential for shooters seeking repeatable ballistic performance downrange.

The mould features steel alignment pins that maintain block-to-block integrity through extended casting sessions, preventing the cavity drift that degrades bullet uniformity over time. A 3/16-inch solid steel sprue plate secured with tempered steel spring washers and screws provides rigid support during the pour and cooling cycle. The .401" cavity size accommodates .40-caliber cast bullets at the 180-grain weight specification, offering a moderate ballistic coefficient suitable for both target work and hunting applications where cast projectiles are permitted.

This mould serves handloaders working with cartridges in the .40 family—including .40 S&W, 10mm, and similar centerfire rounds—who choose to cast their own bullets for cost efficiency and customization. Reloaders benefit from the precision-ground design by achieving tighter weight spreads and more uniform nose profiles, which translate directly to improved accuracy potential and reduced flyer rounds. The double cavity configuration increases casting throughput compared to single cavity tools, making high-volume ammunition production faster without sacrificing dimensional consistency.

RCBS moulds are industry-standard tooling in the handloading community, chosen by competitive shooters, hunters, and ammunition experimenters for their repeatable geometry and extended service life. Proper sizing, lubrication, and alloy composition are essential for consistent results; cast bullets typically require sizing to chambering specifications and may benefit from gas-checking depending on velocity requirements.