The RCBS Neck Expander Plug .264 (MPN: 39859) is a premium-grade, precision-machined steel reloading accessory designed to prepare bottleneck cartridge cases for bullet seating. Engineered specifically to interface with a standard RCBS Neck Expander Die body, this plug performs a critical two-in-one operation in a single press stroke. By expanding the internal neck diameter to the exact size required and applying a precise flare to the case mouth, it ensures optimal bullet alignment and protects projectiles from damage during seating.

Key Features

• Two-in-One Operation: Expands the case neck's internal diameter to precise tolerances while simultaneously belling the case mouth in a single press stroke.
• Cast Bullet Compatibility: Eliminates lead and lubricant shaving by widening and belling the mouth of bottleneck cases, which is highly beneficial for maintaining accuracy in cast projectiles.
• Perfect Bullet Alignment: Squares up the case mouth so that the projectile sits completely straight, reducing bullet tilt and improving overall loaded round concentricity.
• Durable Steel Construction: Solid steel construction ensures long-term dimensional stability and wear resistance under continuous reloading use.

Product Specifications

• Manufacturer Part Number (MPN): 39859
• Calibre Compatibility: .264 inch / 6.5mm
• Required Interface: Fits standard RCBS Neck Expander Die bodies
• Material: Precision-machined solid steel

Who is the RCBS Neck Expander Plug .264 for?

• 6.5mm cast lead bullet rifle reloaders — requiring a .264 inch sizing diameter to flare the case mouth, this RCBS neck expander plug prevents the shaving of lead and lubricant off the sides of cast projectiles during the seating process.
• Bottleneck cartridge precision handloaders — seeking to maximize concentricity in bottleneck cases, this reloading neck expander plug prepares the internal neck diameter to exactly .264 inch to ensure perfectly straight projectile entry and minimize tilt.

Less suitable for: handloading cartridges requiring bullet diameters other than the designated .264 inch threshold, or for use without the necessary housing; reloaders working with different calibres must use a calibre-specific neck expander plug, while those who do not own the compatible die body will require a complete expander die assembly.