Can the Redding 27139 Instant Indicator be used for calibres other than 7mm-08 Remington?

No, this specific model is custom-machined exclusively for the 7mm-08 Remington cartridge and 7mm (.284") bullets. It cannot be used for other calibres without changing the dedicated die body, internal bushing, and headspace reference gauge.

What level of measurement precision does the dial indicator provide?

The unit features a standard 1.000" travel dial indicator with fine 0.001" (one-thousandth of an inch) graduations. This high level of precision allows handloaders to accurately measure shoulder bump, case trim length, and bullet seating depth to achieve match-grade consistency.

Does this tool require a reloading press to operate?

Not necessarily. While it features a standard 7/8"-14 thread to mount directly onto single-stage or progressive reloading presses for bench setup, the included range adapter also allows for convenient use away from the press at the reloading bench or in the field.

Are there any electrical compliance standards or certifications required for this product in Australia?

No electrical compliance or SAA/RCM certifications are required because the Redding 27139 is a completely mechanical precision instrument with no electrical components or power requirements.

Headspace Gauge - Redding 27139

The Redding Instant Indicator Headspace and Bullet Seating Depth Comparator with Dial Indicator for 7mm-08 Remington (MPN 27139) is a press-mounted precision measuring instrument designed to check fired cases, sized brass, and finished ammunition. Threaded for standard 7/8″-14 reloading presses, this mechanical tool allows handloaders to measure shoulder bump within 0.001″ resolution and verify cartridge base-to-ogive (CBTO) bullet seating depth without relying on handheld calipers.

Key Features

Precise Shoulder Bump Measurement: Compares fired brass against full-length sized cases using a dedicated shoulder contactor and calibre-matched headspace reference gauge.
Base-to-Ogive Seating Uniformity: Measures bullet seating depth off the ogive using an included 7mm (.284″) bore-diameter bushing, removing tip inconsistency from overall length measurements.
Direct Press Mounting: Installs directly into standard 7/8″-14 single-stage or progressive reloading presses for fast, repeatable batch inspection.
Rapid Sorting: Enables quick sorting of raw projectiles, trimmed case lengths, and finished cartridges using the included flat surface contactor.
Mechanical Reliability: Fully mechanical setup requiring no electrical power, utilizing a standard 1.000″ travel dial indicator.

Specifications

Calibre Specificity: 7mm-08 Remington
Manufacturer Part Number (MPN): 27139
Dial Indicator Travel: 1.000″
Dial Indicator Resolution: 0.001″ graduations
Press Threading: 7/8″-14
Bushing Size: 7mm (.284″) bore-diameter
Included Components: Calibre-specific die body, 1.000″ travel dial indicator, 7mm bore bushing, shoulder contactor, flat surface contactor, headspace reference gauge, instruction manual
Packaged Weight: Approximately 0.5–0.6 kg

Who is the Redding 27139 Instant Indicator Headspace Comparator For 7mm-08 Rem for?

Precision long-range target shooters loading 7mm-08 Remington ammunition — Mounts into standard 7/8″-14 presses to measure cartridge base-to-ogive depth in 0.001″ graduations via a dedicated 7mm bushing, eliminating bullet meplat variations during batch seating depth checks.
Handloaders seeking extended brass life through precise shoulder bump control — Provides direct 0.001″ dial indicator readouts against a dedicated 7mm-08 Remington headspace gauge to ensure sizing dies bump case shoulders by exact target amounts (such as 0.001″ to 0.002″ for bolt actions) without overworking brass.

Less suitable for: Reloaders seeking a single measurement tool for multiple cartridge families; this headspace comparator is calibre-specific to 7mm-08 Remington and cannot measure other calibres without changing the die body, bushing, and gauge, making modular multi-calibre caliper comparator insert systems better suited for multi-cartridge setups.

SKU	RD102298LP
Model #	27139
Brand	Redding
Shipping Weight	0.3000kg

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Redding 27139 Instant Indicator Headspace Comparator 7mm-08 Rem

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