Redding Instant Indicator .300 Remington SAUM

• Cartridge-Specific Fit: Built for .300 Remington SAUM, this Instant Indicator gives repeatable measurements on the cases and loaded rounds that matter for this chambering, helping handloaders make precise die adjustments without switching to a more generic gauge.
• Headspace Comparison Tool: The design lets you compare fired and sized cases quickly, which makes it easier to control shoulder bump and set a sizing die for reliable chambering with less guesswork.
• Seating Depth Uniformity Check: It also measures bullet seating depth consistency, a practical advantage when building ammunition for tighter velocity spreads and more uniform on-target results.
• Ready for Multiple Measurement Tasks: Beyond headspace and seating depth, the Instant Indicator can be used to check trim-length consistency and sort cases or bullets, making it a useful bench tool for more systematic case preparation.
• Steel Construction: The steel body suits regular workshop use and gives the tool the stable feel needed for repeatable comparator work during detailed handloading sessions.

About the Instant Indicator Series

The Redding Instant Indicator series sits in the brand’s precision handloading range as a dedicated measurement tool for reloaders who want more control over case sizing and bullet seating than a basic case gauge can provide. Rather than serving as a simple pass/fail check, the system is built to compare dimensions between fired, sized and loaded components so the user can tune a die setup around actual brass behavior. That makes the series especially relevant for precision rifle loading, load development and any workflow where consistency matters from batch to batch.

Across the series, the main idea is speed with repeatability. The Instant Indicator is designed to measure shoulder position and bullet seating depth uniformity in a format that supports frequent checks while loading. It is also useful for sorting cases fired in different rifles, checking trim-length consistency and confirming that sizing adjustments are doing exactly what they should. Because the series is offered in cartridge-specific versions and can also work across some cartridge families with similar geometry, it fits naturally into a serious reloading bench where measurement is part of the normal process rather than an occasional correction.

About the Redding Instant Indicator .300 Remington SAUM

The Redding Instant Indicator .300 Remington SAUM is tailored to reloaders working with the .300 Remington Short Action Ultra Mag, a cartridge often chosen for compact magnum performance and careful load tuning. In that role, this comparator-style tool helps the handloader measure how far a shoulder has been moved during sizing and how uniform bullet seating depth remains across a loaded batch. Those are practical checks that matter when building ammunition for dependable chambering and more consistent ballistic performance.

For this chambering, the value of the tool is not just that it measures, but that it measures in a way that supports adjustment. Comparing a fired case to a sized one makes it easier to set a sizing die for the amount of shoulder bump a particular rifle prefers. Checking loaded rounds for seating-depth variation helps identify whether the seating process is producing uniform results or whether further die setup is needed. In practice, that means less trial and error at the bench and a clearer path to repeatable ammunition.

The Instant Indicator is also useful beyond one single task. It can help sort cases for uniformity, check trim-length consistency and compare brass from different rifles. With its steel construction and cartridge-specific setup, this Redding tool suits reloaders who want a dedicated measurement instrument for case preparation and ammunition refinement rather than a general-purpose gauge that only gives a broad go/no-go answer.

About Redding

Redding Reloading Equipment was founded by Burr Bement in 1946 in Virgil, New York. The company built its reputation around tools and equipment for handloading ammunition, with a product range that includes reloading dies, presses, powder measures, scales and case-preparation tools. That long focus on the loading bench is directly relevant to products such as the Instant Indicator, which are intended for reloaders who want more control over measurement and setup.

Redding also became known for specialized rifle-loading products such as Type S bushing dies and the Competition series dies. The company was incorporated as Redding-Hunter, Inc. in 1956 and later marketed its products under the Redding Reloading Equipment name in the 1960s. Today, with headquarters in Cortland, New York, Redding remains closely associated with precision-oriented reloading tools made for rifle and handgun ammunition work.

Main Features

• Product Type: Instant Indicator comparator
• Categories: Case and Headspace Gauges, Comparators
• Compatible Calibers: .300 Remington Short Action Ultra Mag, .300 RSAUM
• Material: Steel
• Application: Case preparation
• Color: Silver
• Bullet Diameter (mm): 7.82 mm
• Bullet Diameter (inch): 308.00 inch
• Made in: USA

Warranty

This Redding Instant Indicator is covered by a 2-year warranty.

In the Box

• Instant Indicator body
• One bore diameter bushing
• Surface contactor
• Shoulder contactor
• Headspace gauge
• Complete instructions