Swing-Lock Custom Muzzleloading makes patented, adjustable bullet-resizing dies for sabotless muzzleloader shooting, allowing shooters to tune bullet diameter with micrometer-level precision. Made in the USA from heat-treated tool steel, its smooth and full-form dies are built for standard reloading presses and can be custom-made in different calibers. The full-form design uses a section of the rifle’s barrel to match its rifling geometry, a distinctive approach intended to improve bullet fit and sealing.