The Hornady Custom-Grade New Dimension 7mm Seating Die (MPN: 044133) is a precision metallic cartridge reloading die engineered to seat 0.284" diameter projectiles across standard, magnum, and ultra-magnum cases. Built with industry-standard 7/8"-14 threads, it mounts directly to standard single-stage and progressive reloading presses. It features an internal floating alignment sleeve that aligns the cartridge case neck and projectile before bullet seating begins, minimising bullet runout and preventing base deformation during the stroke.

Key Features

• In-Line Floating Alignment Sleeve: Pre-aligns the cartridge case neck and 0.284" projectile before the bullet enters the case, reducing bullet runout and protecting the projectile base.
• Built-In Roll Crimp: Features an integrated roll crimp shoulder that allows reloaders to seat and crimp simultaneously, or back the die body off to seat without applying a crimp.
• Sure-Loc™ Lock Ring: Includes a split-ring clamp design with wrench flats that secures the die body without driving a set screw directly into the 7/8"-14 mounting threads.
• Tensioned Seater Adjustment: Employs an internal O-ring tension system on the adjustment stem to hold precise overall length (COAL) settings under repeated press strokes.

Specifications

• Brand: Hornady
• Model / MPN: 044133
• Thread Standard: 7/8"-14 thread
• Calibre Compatibility: 7mm (.284" bullet diameter)
• Cartridge Compatibility: .280 Remington, .280 Ackley Improved, 7mm Remington Magnum, 7mm PRC, 7x57 Mauser, 7x57R, 7x64, 7x65R, 7mm Weatherby Magnum, 7mm STW, 7mm Remington Ultra Magnum (RUM), and 28 Nosler
• Dimensions: Approximately 175 mm (6.875 in) L × 31.8 mm (1.25 in) W × 31.8 mm (1.25 in) H
• Weight: Approximately 234 g to 285 g (0.515 lb to 0.63 lb)
• Power Requirements: None (manual mechanical operation)

Who is the Hornady 7mm Seating Die For 280 Rem, 7mm Rem Mag, 7mm Prc, 7x57, 7mm Wby, 7mm Rum, 28 Nosler for?

• 7mm hunting cartridge handloaders — Mounts into standard 7/8"-14 thread reloading presses to align and seat 0.284" diameter projectiles into medium and magnum hunting cases such as .280 Remington and 7mm Remington Magnum while offering an integrated roll crimp option.
• Precision long-range target shooters — Uses an in-line floating alignment sleeve to true 0.284" diameter bullets with the case neck prior to seating, minimising bullet runout for match-grade consistency across modern high-capacity cartridges like the 7mm PRC and 28 Nosler.

Less suitable for: Handloaders loading non-7mm calibres such as .264" (6.5mm), .277", or .308" rifle cases, or short-action specialty cartridges like the 7mm TCU and 7mm BR; these require caliber-specific seating dies or dedicated short-case seating dies designed for reduced cartridge lengths.