Lyman's improved bullet sizing dies now feature 90-degree hole spacing, making it significantly easier to apply even today's harder bullet lubricants with consistent coverage. Engineered for precision, each die includes a tapered mouth to guide bullets into perfect alignment and a hardened interior bore that maintains an ideal cylindrical profile. These internal dimensions are calibrated to match recommended sizing diameters across all major rifle and pistol calibers, ensuring compatibility and accuracy in every reload. To prevent nose deformation, Lyman's precisely machined top punches are designed to match the bullet's nose contour exactly, providing a flawless fit and professional-grade results. Refer to the sizing chart for optimal caliber selection. Constructed with high-grade hardened steel for maximum strength and resilience The tapered mouth design improves feeding and reliability in your firearm 90 degree lube holes facilitate optimal lubrication for smooth mechanical operation Compatible with RCBS punches for versatile reloading options