The RCBS part number 31340 corresponds to the RCBS .270 WSM MatchMaster Competition Seating Die. This premium, match-grade reloading die is designed for handloaders seeking top-tier precision and consistency for the .270 Winchester Short Magnum (WSM) cartridge. Micrometer Adjustment: Features a micrometer thimble with thousandth-of-an-inch increments, allowing you to dial in your exact bullet seating depth with precision. Sliding Case Guide: Centers the brass in the die before seating, ensuring the bullet perfectly aligns with the case neck. Bullet Retention & Floating Seat Plug: The internal design keeps the bullet securely in place while floating to minimize runout (cartridge wobble). Match-Grade Tolerances: Built to exacting standards to shrink group sizes and maximize consistency.