Can I use the Redding 56155 Competition Neck Die with my semi-automatic .308 Winchester service rifle?

No, neck sizing dies are strictly recommended for bolt-action rifles where fire-formed brass matches your specific chamber. Semi-automatic, pump, or lever-action .308 rifles require full-length or small-base sizing dies to ensure reliable chambering and extraction.

Does the Redding 56155 die include sizing bushings, or do I need to purchase them separately?

The neck sizing bushings are sold separately and are available in 0.001-inch increments to fine-tune your neck tension. For example, you can pair it with Redding heat-treated steel sizing bushings like the Redding 73333 depending on your brass wall thickness.

How do I set up the micrometer head and sliding chamber sleeve during initial calibration?

The die features a precision-ground sliding sleeve that aligns the case before it enters the self-centring bushing. The integrated micrometer head, calibrated in 0.001-inch graduations, allows you to dial in exact partial or full-neck sizing depths and reliably document your settings.

At what point do I need to stop using just this neck die and resize the entire case body?

After 3 to 5 firings, fire-formed cases typically lengthen at the shoulder and become hard to chamber. At this stage, you will need to incorporate a dedicated Redding Body Die or switch to a Full Length Bushing Die to bump the shoulders back by 0.001 to 0.002 inches.

.308 Neck Die - Redding 56155

The Redding Competition Bushing Neck Sizing Die – .308 Winchester (MPN: 56155) sizes the neck of fire-formed .308 Winchester cartridge brass while maintaining concentricity and bullet runout control. Designed for bolt-action target rifles, it sizes exclusively the case neck without working the body or shoulder. The die features a precision-ground sliding chamber sleeve that captures and aligns the case before sizing, paired with a self-centring, floating bushing design and an integrated top micrometer.

Key Features

Sliding Chamber Sleeve: Captures, aligns, and fully supports the .308 Winchester case before the neck enters the sizing bushing to prevent runout.
Micrometer Adjustment: Calibrated in 0.001″ graduations to allow reloaders to dial and document exact neck sizing lengths for partial or full-neck sizing.
Self-Centring Bushings: Accepts interchangeable Redding neck sizing bushings (available in 0.001″ increments, sold separately) that float within the die to self-centre on the case neck.
Straight-Line Decapping: Internal decapping assembly operates without an expander ball to prevent brass stretching during depriming.

Product Specifications

Manufacturer Part Number (MPN): 56155
Calibre Compatibility: .308 Winchester (.308 in / 7.82 mm bullet diameter)
Press Thread Interface: Industry-standard 7/8"-14 reloading press thread
Shellholder Compatibility: Redding Shellholder #1 (#11001) or Competition Shellholder #1 (#11601)
Bushing System: Redding interchangeable neck sizing bushings (sold separately)
Packaged Weight: Approximately 450 g (1 lb)
Power Requirement: Manual mechanical operation

Who is the Redding 308 Win Competition Neck Die for?

Precision F-Class and benchrest target shooters — sizes fire-formed .308 Winchester brass (.308 in / 7.82 mm bullet diameter) using a micrometer head calibrated in 0.001″ graduations to control exact neck sizing length and maintain minimal bullet runout across match ammunition.
Bolt-action handloaders seeking neck tension control — mounts to standard 7/8"-14 threaded reloading presses and utilizes floating bushings adjustable in 0.001″ increments to set precise neck tension without over-working brass bodies or resizing fire-formed shoulders.

Less suitable for: Semi-automatic, pump, or lever-action .308 rifles requiring full-length or small-base sizing dies to ensure reliable cycling, as well as fire-formed cases after 3 to 5 firings that have experienced shoulder growth and require a body die or full-length bushing die to bump shoulders 0.001″ to 0.002″.

SKU	RD41664LP
Model #	56155
Brand	Redding
Shipping Weight	1.0000kg

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Redding 56155 Competition Neck Die 308 Winchester Micrometer Adjust

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