RCBS Neck Expander Die Features The RCBS Neck Expander Die for .257 caliber combines a neck sizer expander and decapping unit in one complete die simplifying the case preparation steps that come before bullet seating. Flaring the case mouth to just beyond bullet diameter lets the bullet drop in straight rather than catching or deforming the case neck which keeps seated bullets concentric with the case body. That alignment carries through to how consistently the round chambers and how uniformly it releases the bullet at firing both of which matter to accuracy-focused reloaders. Built from high-quality steel this die is designed to hold its dimensions through repeated use without excessive wear affecting its sizing consistency. RCBS backs this neck expander die with a lifetime guarantee reflecting the company s long-standing reputation among reloaders for durable dependable equipment. The die ships in a convenient plastic storage case that keeps it protected and organized alongside the rest of a reloading bench setup. For anyone loading .257 caliber ammunition at home this expander die is an affordable way to add a dedicated case-prep step that improves bullet seating and overall round quality. It is a straightforward purpose-built tool that fits into any standard reloading press setup for .257 caliber work. RCBS Neck Expander Die Specifications Manufacturer: RCBS Model: Neck Expander Die Caliber: .25 Caliber Material: Steel Available At: GrabAGun