The RCBS 243 Win X Full Length Die Set (Manufacturer Part Number: 37312) is a specialized, manual reloading tool designed to streamline the brass preparation process for bottleneck rifle cases. By utilizing a patented X-Die design, this 2-die set solves the common issue of progressive case stretching during repeated resizing cycles. This purely mechanical hardware is compatible with standard 7/8"-14 thread reloading presses and does not require any electrical power or Australian regulatory certifications (such as SAA or RCM), making it a reliable addition to any Australian handloading setup.

Key Features

• Patented X-Die Mandrel: Features a specially engineered internal mandrel with an expander ball and decapping pin that actively limits case growth during the sizing process.
• Elimination of Repeated Trimming: Once cases are initially trimmed to a specific calibration depth, the case mouth contacts the mandrel during subsequent sizing cycles, completely halting further growth and removing the need for repeated trim steps.
• No Neck-Wall Thickening: Exceptionally close tolerances between the internal mandrel and the die neck wall prevent the brass from thickening as length growth is restricted, maintaining consistent neck tension and extending case life.
• Complete 2-Die Set: Includes one full-length X-Sizer Die to resize the case and de-cap spent primers, and one Standard Seater Die to seat the bullet.
• Steel Construction: Manufactured from high-quality steel, requiring manual case lubrication prior to sizing to ensure smooth operation and prevent stuck cases.

Product Specifications

• Compatible Calibre: .243 Winchester bottleneck rifle cases
• Thread Size: Standard 7/8"-14 reloading press threads
• Die Set Contents: Full-length X-Sizer Die, Standard Seater Die
• Initial Trim Threshold: Cases must be trimmed 0.020 inches below maximum case length before use
• Shipping Weight: Approximately 1.25 lbs (0.57 kg)
• Power Requirements: None (manual, mechanical operation)

Who is the Rcbs 243 Win X Full Length Die Set for?

• High-volume .243 Winchester precision reloaders — seeking to eliminate the bottleneck of repeated brass trimming by using a reloading die set that permanently halts case growth after a single initial trim of 0.020 inches below maximum case length.
• Handloaders seeking to eliminate case trimming steps — who require a mechanical sizer die compatible with standard 7/8"-14 thread presses that prevents case-neck thickening while processing high volumes of .243 Winchester brass.

Less suitable for: semi-automatic or tight-chamber platforms requiring small base sizer dies, straight-walled cartridges requiring carbide 3-die sets, or elite benchrest shooters requiring micro-adjustable bushing-style competition dies.