The RCBS Uniflow Powder Measure 3 represents the latest evolution of one of the most respected and enduring tool designs in the history of metallic cartridge reloading. For decades, the original Uniflow served as the primary volumetric dispensing solution for millions of handloaders, praised for its rugged cast iron construction and its ability to throw consistent charges across a wide range of powder types. With the release of the RCBS Uniflow Powder Measure 3, RCBS has addressed the primary limitation of the previous generation by utilizing a single, universal metering cylinder that eliminates the need for users to swap between small and large assemblies when transitioning from pistol to rifle calibers. This redesign simplifies the workflow while maintaining the heavy-duty architecture that has made RCBS a staple on reloading benches worldwide.
As a volumetric dispenser, the RCBS Uniflow Powder Measure 3 operates on the principle of consistent cavity displacement. By adjusting a precision-threaded internal plunger, the reloader defines a specific volume within the metering cylinder that corresponds to a desired weight of a specific smokeless powder. While electronic dispensers have gained popularity for their automated precision, a mechanical tool like the RCBS Uniflow Powder Measure 3 remains essential for high-volume reloading sessions where speed and mechanical reliability are paramount. Whether you are loading for a 223 Remington or a 308 Winchester, this tool provides a level of tactile feedback and durability that digital alternatives often lack.
- Tool Category: Volumetric Powder Measure
- Operation Type: Manual Crank-Lever
- Mechanical Standout: Universal Metering Cylinder (Standard and Magnum capacity)
- Best For: High-volume precision reloaders who require a durable, bench-mounted dispenser capable of handling everything from small handgun charges to large rifle loads without swapping internal components.
Technical Specifications and Market Pricing
The RCBS Uniflow Powder Measure 3 is engineered to provide a lifetime of service, utilizing materials and machining tolerances that reflect its position as a professional-grade tool. The core of the unit is a precision-machined cast iron body, which provides the necessary mass to resist vibration and ensures that the internal tolerances remain consistent over thousands of cycles. Unlike lighter aluminum or plastic alternatives, the cast iron housing of the RCBS Uniflow Powder Measure 3 is less susceptible to temperature-induced expansion and contraction, which can subtly alter charge weights during long reloading sessions in unconditioned environments.
| Field | Value |
| Model | RCBS Uniflow Powder Measure 3 |
| MPN or SKU | 9015 |
| Materials | Cast Iron Body / Polished Steel Metering Cylinder |
| Weight | Approx. 3.5 Pounds |
| Country of Origin | USA |
| MSRP | $124.95 |
| Approx. Street Price | $98.00-112.00 |
The pricing of the RCBS Uniflow Powder Measure 3 places it firmly in the mid-to-high range of mechanical measures. While budget-oriented options exist, the value proposition of the RCBS Uniflow Powder Measure 3 lies in its longevity and the inclusion of the universal metering system. In previous versions, a reloader would often need to purchase a separate small or large cylinder assembly to cover the full spectrum of reloading needs, effectively increasing the total cost of ownership. By integrating these into a single unit, RCBS has improved the value for the end user. The street price remains competitive, often found near the $100 mark at major retailers, making it a justifiable investment for anyone serious about the hobby.
The technical refinement of the RCBS Uniflow Powder Measure 3 is also evident in its hopper design. The clear, anti-static hopper allows the user to monitor powder levels easily while preventing the “bridging” or clinging of individual granules to the sidewalls. This is particularly important when using fine-grained powders or those with high graphite content. The 7/8-14 threading on the base of the RCBS Uniflow Powder Measure 3 ensures compatibility with the standard RCBS powder measure stand, as well as various press mounting brackets and reloading stands from other manufacturers.
Build Quality, Materials, and Ergonomics
The build quality of the RCBS Uniflow Powder Measure 3 is centered around its heavy cast iron casting. This material choice is intentional, as the weight of the casting helps to dampen the “thump” felt when the handle reaches the top of its stroke, a movement often used by reloaders to ensure the powder has fully settled into the metering chamber. The casting is finished in the signature RCBS green powder coat, which provides excellent resistance to oils, solvents, and the mildly corrosive nature of some reloading chemicals. Internally, the RCBS Uniflow Powder Measure 3 features a precision-ground steel metering cylinder that rotates within the body with minimal clearance. This tight fit is critical for preventing “powder shearing,” a phenomenon where granules of powder get caught between the cylinder and the body, causing the handle to bind and potentially leading to inconsistent charge weights.
Ergonomically, the RCBS Uniflow Powder Measure 3 is designed for a natural, rhythmic motion. The handle is long enough to provide ample leverage, even when cutting through the occasional large grain of extruded powder like Hodgdon Varget or IMR 4064. The grip is shaped to reduce hand fatigue during extended sessions where a reloader might throw 500 or more charges for a high-volume handgun caliber like 9mm Luger or 45 ACP. Because the handle can be mounted for either right-handed or left-handed operation, the RCBS Uniflow Powder Measure 3 offers a level of versatility that accommodates any bench layout.
The mechanical feedback provided by the RCBS Uniflow Powder Measure 3 is one of its greatest assets. An experienced reloader can feel the difference between a clean “throw” and a “crunch” when a powder grain is sheared. This tactile connection allows the user to decide instantly whether to dump a suspect charge back into the hopper and re-throw, a level of quality control that automated electronic scales cannot provide. The stability provided by the cast iron frame ensures that the RCBS Uniflow Powder Measure 3 does not flex or tilt during operation, which is a common complaint with plastic-bodied measures found in entry-level kits.
Comprehensive Setup, Calibration, and Operation
Setting up the RCBS Uniflow Powder Measure 3 begins with securing the unit to a stable platform. Most users utilize the standard 7/8-14 threaded interface to mount the measure to a dedicated bench stand or a press-mounted bracket. It is essential that the RCBS Uniflow Powder Measure 3 be mounted perfectly vertical; any significant tilt can affect how the powder column settles, potentially leading to variations in the volume of the charge. Once mounted, the hopper should be cleaned with a dryer sheet or an anti-static spray to remove any residual oils from the manufacturing process, which can cause powder to stick and “bridge” within the throat of the measure.
Calibration of the RCBS Uniflow Powder Measure 3 is a manual process that requires a high-quality digital or mechanical powder scale. To begin, the user loosens the lock nut on the metering screw and adjusts the plunger to a baseline setting. After filling the hopper at least halfway with powder, the handle should be cycled 10-15 times to settle the powder column before taking any measurements. To set a specific weight, such as 25.0 grains of Hodgdon H335, the user will throw a charge, weigh it, and make incremental adjustments to the metering screw of the RCBS Uniflow Powder Measure 3. Turning the screw inward decreases the volume, while turning it outward increases the volume. Once the desired weight is achieved consistently across five consecutive throws, the lock nut is tightened to secure the setting.
The operation of the RCBS Uniflow Powder Measure 3 relies on a consistent “throw” technique. The reloader should lift the handle to the top of the stroke with a firm, deliberate motion, often giving the handle a slight tap at the top to ensure the metering cavity is filled. The handle is then lowered to drop the powder through the drop tube and into the waiting cartridge case. Maintaining a uniform cadence is the secret to achieving low standard deviations with the RCBS Uniflow Powder Measure 3. If the user varies the speed or force of the handle stroke, the density of the powder in the cylinder will change, leading to weight variations. Regular maintenance involves emptying the hopper after every session and periodically wiping down the steel cylinder with a dry cloth to prevent rust, especially in humid climates.
Internal Brand Hierarchy
Within the RCBS product ecosystem, the RCBS Uniflow Powder Measure 3 sits as the primary mechanical dispensing tool, bridging the gap between basic equipment and high-end automation. It is positioned above the entry-level plastic measures often found in competitor kits but below the highly sophisticated electronic systems like the RCBS MatchMaster Digital Powder Scale Dispenser. While the MatchMaster offers extreme precision down to 0.04 grains, the RCBS Uniflow Powder Measure 3 is preferred by many for its simplicity and the fact that it does not require electricity or warm-up time to function.
Compared to the older Uniflow models, the RCBS Uniflow Powder Measure 3 represents a significant streamlining of the brand’s offerings. In the past, RCBS offered the Uniflow with either a small or large cylinder, which forced reloaders to buy multiple kits or conversion parts if they reloaded both 25 ACP and 300 Winchester Magnum. The RCBS Uniflow Powder Measure 3 replaces both with its universal design, effectively making it the “one-size-fits-all” mechanical measure for the modern RCBS catalog. For those who prioritize speed on a progressive press, RCBS also offers the Case Activated Powder Measure, which uses many of the same internal principles as the RCBS Uniflow Powder Measure 3 but is triggered by the upward movement of the press ram.
Competitive Market Analysis
The RCBS Uniflow Powder Measure 3 competes in a market saturated with high-quality volumetric tools. Its primary rivals are the Hornady Lock-N-Load Bench Rest Powder Measure and the Redding 3 Powder Measure. While all three utilize the same basic rotating cylinder concept, the RCBS Uniflow Powder Measure 3 distinguishes itself through its specific metallurgy and the “all-in-one” nature of its current iteration.
| Tool | Materials | Feed System or Operating Method | Versatility | Price Class |
| RCBS Uniflow Powder Measure 3 | Cast Iron / Steel | Rotating Cylinder (Universal) | High (Pistol to Large Rifle) | Mid-Range |
| Hornady Lock-N-Load Bench Rest Powder Measure | Aluminum / Steel | Rotating Cylinder (Interchangeable) | High (Requires Inserts) | Mid-Range |
| Redding 3 Powder Measure | Cast Iron / Steel | Rotating Cylinder (Classic) | High (Handgun/Rifle Models) | Premium |
| Lyman Brass Smith Powder Measure | Cast Iron / Steel | Rotating Cylinder (Ambidextrous) | High (Universal) | Budget-Mid |
When compared to the Hornady Lock-N-Load Bench Rest Powder Measure, the RCBS Uniflow Powder Measure 3 is often praised for the “heaviness” of its cast iron construction, which some users feel provides a more stable platform. However, the Hornady system uses a quick-change insert feature that some reloaders find faster when switching between pre-set loads. The Redding 3 Powder Measure is often considered the gold standard for “fit and finish” but generally comes at a higher price point. The RCBS Uniflow Powder Measure 3 hits the “sweet spot” for many users, offering the ruggedness of a cast iron body at a price that is accessible to the average hobbyist.
In the broader Powder Measure Showdown, the RCBS unit remains a top contender because of the brand’s legendary customer service and the availability of replacement parts. For a reloader looking for a tool that can grow with them as they expand from a single handgun caliber to a dozen different rifle calibers, the RCBS Uniflow Powder Measure 3 offers a path that requires the least amount of additional hardware.
Real-World Feedback and Troubleshooting
User feedback for the RCBS Uniflow Powder Measure 3 is overwhelmingly positive, particularly regarding its ability to accurately throw spherical powders like Hodgdon H335 or Winchester 231. With these “ball” powders, the RCBS Uniflow Powder Measure 3 can often maintain weights within 0.1 grains over hundreds of throws. However, like all volumetric measures, it faces challenges with large-grain extruded powders. Users often report that while the RCBS Uniflow Powder Measure 3 is highly consistent, the “crunching” of long powder sticks can occasionally lead to a slight weight variation, necessitating a “trickle-up” approach for those loading extreme long-range match ammunition.
Pros
- Exceptionally durable cast iron construction.
- No need to swap cylinders for different charge ranges.
- Ambidextrous handle mounting.
- Standard 7/8-14 threading fits almost all stands and presses.
- Smooth operation with spherical and fine-flake powders.
Cons
- Can shear large-grain extruded powders, leading to tactile “crunch.”
- Cast iron requires protection from rust in high-humidity areas.
- Hopper can develop static if not treated initially.
Troubleshooting Known Quirks
- Powder Bridging: If powder fails to drop consistently, it is often due to static in the hopper. Wipe the inside of the hopper with a used dryer sheet to neutralize the charge.
- Binding Handle: If the handle becomes difficult to move, a small granule of powder may be caught in the tolerances. Do not force the handle. Empty the RCBS Uniflow Powder Measure 3, remove the cylinder, and clean the interface with a dry brush.
- Inconsistent Weights: This is usually caused by an inconsistent handle stroke. Ensure you are using the same force and “tap” at the top and bottom of every cycle to ensure the powder settles identically each time.
FAQ
Can the RCBS Uniflow Powder Measure 3 be used with a progressive press?
Yes, but it typically requires the addition of an RCBS Case Activated Linkage Kit to allow the cartridge case to trigger the powder drop automatically.
Does this measure come with a stand?
Generally, the RCBS Uniflow Powder Measure 3 is sold as a standalone unit. You will need to purchase a powder measure stand or a press-mounting bracket separately.
Is the metering screw micrometer-adjustable?
The standard RCBS Uniflow Powder Measure 3 comes with a threaded adjustment screw with a lock nut. RCBS offers a micrometer adjustment screw as an aftermarket upgrade for those who want repeatable numerical settings.
How do I clean the RCBS Uniflow Powder Measure 3?
Use a dry cloth and a soft brush. Avoid using wet solvents or oils inside the measure, as these can cause powder to clump and lead to dangerous inconsistencies.
What is the maximum charge weight the RCBS Uniflow Powder Measure 3 can throw?
The universal cylinder is designed to throw from approximately 0.5 grains up to 95-100 grains of most powders, covering everything from small pistol to large magnum rifle loads.
Will the RCBS Uniflow Powder Measure 3 work with black powder?
No. Standard powder measures like the RCBS Uniflow Powder Measure 3 are designed for smokeless powder only. Black powder requires specialized “spark-proof” measures, typically made of brass or aluminum, to prevent accidental ignition.
Why is my measure throwing inconsistent weights with Varget?
Varget is a large-grain extruded powder. Volumetric measures naturally struggle with these “sticks” because they don’t settle as densely as spherical powders. Using a powder baffle inside the hopper can help improve consistency.
Can I swap parts from my old Uniflow into the RCBS Uniflow Powder Measure 3?
Most parts, including the hopper and drop tubes, are compatible, but the internal metering cylinder design has changed, so cylinders are generally not interchangeable between the old and new versions.
How do I prevent rust on the cast iron body?
Keep the exterior of the RCBS Uniflow Powder Measure 3 lightly wiped down with a quality gun oil, but ensure no oil gets into the internal powder path.
Conclusion and Expert Verdict
The RCBS Uniflow Powder Measure 3 is a masterclass in functional evolution. By taking a design that worked for half a century and refining it to meet the “do-it-all” expectations of modern reloaders, RCBS has created a tool that is as relevant today as it was in the era of the first Rock Chucker. The move to a single, universal metering cylinder is a major win for user convenience, eliminating the frustration of hunting for the “other” cylinder when switching from a 9mm Luger practice load to a 30-06 Springfield hunting round. The build quality remains the benchmark for the industry, with the cast iron body providing a sense of permanence that plastic tools simply cannot match.
For the serious handloader, the RCBS Uniflow Powder Measure 3 is more than just a dispenser; it is a foundational piece of equipment. While it may not replace an electronic scale for ultra-precise, long-range load development, its speed and reliability make it the superior choice for the vast majority of reloading tasks. It offers a tactile connection to the process that helps a reloader understand the behavior of different powders, and its durability ensures it will likely be passed down to the next generation of shooters. If you value mechanical simplicity, ruggedness, and versatility, the RCBS Uniflow Powder Measure 3 is arguably the best investment you can make for your reloading bench.
Expert Pro Tip: To achieve the highest possible consistency with the RCBS Uniflow Powder Measure 3, install a powder baffle halfway down the hopper; this ensures that the pressure on the powder at the metering cylinder remains constant regardless of whether the hopper is full or nearly empty.
