Brownells RCBS Chronograph Ammomaster (RCB81190)
RCB81190 – Precision chronograph for reloaders.The Brownells RCBS Chronograph Ammomaster (RCB81190) delivers laboratory‑grade velocity measurement for handloaders, competitive shooters, and firearms enthusiasts who demand consistent performance. Designed for durability and ease of use, this chronograph integrates seamlessly into any reloading workflow, giving you the data you need to fine‑tune loads for maximum accuracy and safety.
Key Features & Benefits
- High‑speed dual‑sensor system: Captures velocities up to 5,000 fps with ±0.5% accuracy.
- Large, back‑lit LCD display: Read results instantly even in low‑light conditions.
- USB data export: Transfer velocity logs directly to a computer for detailed analysis.
- Adjustable sensor spacing (12–30 inches): Perfect for everything from .22 LR to .50 BMG.
- Rugged aluminum housing: Built to withstand the rigors of a busy reloading bench.
- Battery‑efficient operation: Up to 150 hours of continuous use on a single set of AA batteries.
- Easy calibration: One‑button calibration with a standard 100‑yard reference target.
- Comprehensive software package: Includes free ChronoTrack™ software for trend analysis, graphing, and load development.
Detailed Product Overview
When you’re loading ammunition, the only way to verify performance is through precise measurement. The RCB81190 Ammomaster combines cutting‑edge chronograph technology with user‑friendly features to provide you with the most reliable velocity data on the market. Its dual‑sensor optical system captures the exact moment a projectile passes each sensor, calculating true velocity without the need for complex calculations.
The device’s adjustable sensor spacing gives you the flexibility to test a wide range of calibers, from low‑velocity varmint rounds to high‑energy magnum loads. The large, back‑lit LCD screen presents data in real‑time, including velocity, average velocity, standard deviation, and shot‑to‑shot variation. All results can be saved to an internal memory bank or exported via USB to the included ChronoTrack™ software, allowing you to chart trends, compare loads, and make data‑driven decisions.
Why Choose the Brownells RCBS Chronograph Ammomaster?
Unmatched Accuracy: Laboratory‑grade precision ensures that every measurement reflects the true performance of your load.
Durable Construction: Engineered with a rugged aluminum chassis, the Ammomaster endures the harsh environment of a busy reloading bench.
Plug‑and‑Play Simplicity: No complicated setup—just position the sensors, calibrate with the built‑in button, and start shooting.
Data Integration: Seamlessly export data to Excel, CSV, or the ChronoTrack™ software for in‑depth analysis.
Technical Specifications
| Model | RCB81190 |
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| Manufacturer | RCBS (Brownells) |
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| UPC | 076683811905 |
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| Velocity Range | 0 – 5,000 fps |
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| Accuracy | ±0.5% (±1.5 fps @ 3,000 fps) |
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| Sensor Spacing | Adjustable 12–30 inches (30–76 cm) |
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| Power Supply | 2 x AA alkaline batteries (included) |
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| Display | 5.5” back‑lit LCD, 480×320 resolution |
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| Data Interface | USB 2.0 (data export only) |
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| Operating Temperature | -20°C to +50°C (−4°F to +122°F) |
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| Dimensions (L×W×H) | 9.4" × 5.1" × 2.3" (239 mm × 130 mm × 58 mm) |
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| Weight | 2.2 lbs (1 kg) |
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Best Practices for Optimal Use
- Set up the chronograph on a stable, level surface away from direct sunlight.
- Adjust sensor spacing to match the bullet’s velocity range for maximum accuracy.
- Perform a one‑button calibration using the included 100‑yard reference target before each shooting session.
- Record at least five consecutive shots to obtain a reliable average and standard deviation.
- Export data to ChronoTrack™ after each session to track trends over time.
- Regularly clean the sensor lenses with a soft, lint‑free cloth to prevent dust interference.
Upgrade your reloading workflow today with the Brownells RCBS Chronograph Ammomaster (RCB81190). Experience the confidence that comes from precise, repeatable velocity data and take your load development to the next level.
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