Lyman's newly improved bullet sizing dies now feature 90-degree hole spacing, a significant advancement that allows even today's toughest hard lubricants to flow effortlessly through the die body, ensuring consistent and thorough lubrication across a wide range of bullet alloys. Each sizing die is equipped with a precision-engineered tapered mouth that guides the bullet smoothly into a hardened interior channel, aligning it perfectly to maintain its true cylindrical form during the sizing process. These internal dimensions are meticulously calibrated to match the recommended diameters for virtually all popular rifle and pistol calibers, guaranteeing accuracy, reliability and uniformity with every bullet passed through. To further enhance bullet quality, Lyman's top punches are CNC-machined with exceptional precision to match the specific nose profile of each bullet, eliminating any potential for distortion or deformation during sizing. Reloaders can refer to the provided chart to select the correct die size for their caliber, ensuring optimized performance at the bench and downrange. 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