Lyman's latest generation of sizing dies introduces 90-degree lube hole orientation, a deliberate design to support consistent lubrication using even modern, high-durometer lubes. Every die is constructed with a flared entrance that aids in bullet alignment, guiding them into a hardened steel chamber that ensures uniform cylindrical shaping. The internal specifications conform strictly to caliber recommendations for popular handgun and rifle rounds. Additionally, each top punch is engineered with a close-tolerance nose cavity that mirrors the shape of the bullet's front end, eliminating the possibility of nose slump or flattening during sizing. 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