What reloading presses are compatible with the Redding 300 PRC Competition Seating Die in Australia?

This seating die features an industry-standard 7/8"-14 thread interface, making it directly compatible with all popular single-stage and turret reloading presses used on Australian benches, such as the Redding Big Boss, RCBS Rock Chucker, and Hornady Lock-N-Load.

How precise is the micrometer adjustment on the Redding 55776 seating die?

The die features a non-clicking, infinitely adjustable micrometer head calibrated in 0.001" increments, with 0.050" of travel per full revolution. It also includes a resettable zero reference to easily index and track specific bullet seating depths for your match loads.

Does this die apply a crimp to the .300 PRC cartridge case?

No, the Redding Competition Seating Die is strictly a straight-line seating die containing no crimp ring. If your specific loading application requires a roll or taper crimp, you will need to use a separate dedicated crimping die after the seating process.

Will this die accept brass fired from non-standard or custom .300 PRC chambers?

The internal sliding chamber sleeve is built to tight tolerances matching SAAMI and CIP minimum dimensions. Brass that has been fired in severely oversized or out-of-spec custom chambers may fail to enter the sleeve smoothly and must be full-length resized prior to bullet seating.

.300 PRC Seating Die - Redding 55776

The Redding 300 Prc Competition Seating Die (MPN 55776) is a precision reloading tool engineered to seat .308 in (7.82 mm) diameter bullets into .300 Precision Rifle Cartridge cases. Built with a patented sliding chamber sleeve, the die fully supports and aligns the cartridge case and projectile before seating begins, minimizing concentricity runout. Depth adjustments are managed through a top-mounted micrometer head that provides direct, repeatable control over cartridge overall length and base-to-ogive dimensions.

Key Features

Straight-Line Alignment Sleeve: Uses an internal sliding chamber sleeve precision-ground to minimum SAAMI/CIP dimensions to hold the case and bullet in perfect alignment throughout the seating stroke.
Micrometer Depth Adjustment: Features a non-clicking, infinitely adjustable micrometer head graduated in precise 0.001" increments (0.050" travel per full revolution) with a resettable zero reference.
VLD Bullet Seating Stem: Includes a dedicated VLD seating stem profile (#55730) contoured to seat modern high-BC, very-low-drag match projectiles without marring or deforming bullet ogives.
Universal Press Interface: Threaded to the standard 7/8"-14 pitch to fit single-stage and turret reloading presses without requiring proprietary adapters.

Product Specifications

Cartridge Compatibility: .300 Precision Rifle Cartridge (.300 PRC)
Bullet Diameter: .308 in (7.82 mm)
Thread Size: 7/8"-14 standard
Micrometer Calibration: 0.001" per graduation (0.050" per revolution)
Shellholder Compatibility: Redding #6 standard or #6 Competition shellholders (sold separately)
Crimp Function: None (dedicated straight-line seating only)
Operation: Manual mechanical reloading die

Who is the Redding 300 PRC Competition Seating Die for?

Long-range precision rifle competitors — requires seating .308-calibre match bullets into .300 Precision Rifle Cartridge brass with the precision of a 0.001" calibrated micrometer head to fine-tune exact base-to-ogive seating depths.
Extreme long range (ELR) reloaders — benefits from this competition bullet seating die because its internal sliding sleeve fully captures the case and bullet to eliminate concentricity runout on high-BC projectiles across standard 7/8"-14 reloading presses.

Less suitable for: Handloaders processing brass fired in out-of-spec or oversized custom chambers that fail to clear the tight SAAMI-tolerance sliding sleeve (requiring full-length sizing first), or cartridges requiring a roll or taper crimp, which require a dedicated crimping die or standard seat-and-crimp die.

SKU	RD41661LP
Model #	55776
Brand	Redding
Shipping Weight	1.0000kg

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Redding 55776 .300 Prc Competition Seating Die Micrometer

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