The Redding 17111 Instant Indicator Headspace and Bullet Seating Depth Comparator is a precision mechanical reloading tool engineered for the .223 Remington cartridge. Designed to fit standard 7/8"-14 threaded reloading presses or the included handheld Range Adapter, this comparative tool allows handloaders to measure shoulder bump, bullet seating depth from the base to the ogive, and trim length uniformity relative to an included brass calibration gauge. It features a standard 3/8" stem mount designed to accept a user-supplied 1" travel dial indicator, delivering direct comparative readouts to verify sizing die setup and cartridge consistency.

Key Features

• Precision Headspace Comparison: Measures shoulder position between fired and resized cases to ensure exact shoulder bump, typically within 0.001" to 0.003".
• Bullet Seating Depth Verification: Utilises the included .22 calibre bore diameter bushing to measure completed rounds from the cartridge base to the bullet ogive.
• Universal Press and Bench Mounting: Machined with a 7/8"-14 threaded die body for standard single-stage press mounting, alongside an included Range Adapter (MPN 17014) for portable handheld use.
• Standard Dial Interface: Accepts standard 3/8" stem mount dial indicators with 1" travel for immediate comparative readings.
• Complete Setup Kit: Includes the die body, .22 calibre bore bushing, sliding shoulder contactor, sliding flat surface contactor, internal pressure spring, and a dedicated brass set-up gauge (dial indicator sold separately).

Specifications

• Calibre Compatibility: .223 Remington / 5.56×45mm NATO
• Die Thread Size: 7/8"-14 standard thread
• Dial Indicator Stem Mount: 3/8" diameter
• Measurement Resolution: 0.001" (0.0254 mm) when paired with a 0.001" dial indicator
• Operation Type: 100% mechanical comparative measurement tool

Who is the Redding Instant Indicator Headspace Comparator for .223 Remington for?

• Precision target competitors shooting .223 Remington — Requires a 0.001 inch measurement resolution to control bullet seating depth to the ogive and ensure consistent shoulder bump across match-grade ammunition batches.
• Varmint hunters seeking maximum brass life for .223 Remington bolt-action rifles — Relies on this headspace comparator's standard 7/8 inch - 14 threaded die body and 3/8 inch stem mount to accurately set full-length sizing dies, preventing case over-working and extending brass service life.

Less suitable for: Handloaders loading cartridges outside the .223 Remington shoulder geometry, who require a calibre-specific instant indicator die body matched to their specific case dimensions.