RCBS Small Base Taper Crimp Die Set – AR Series Review

The Most Honest RCBS Small Base Taper Crimp Die Set – AR Series Review Online

Reloading ammunition for semi-automatic firearms, particularly those in the AR platform, can sometimes feel like navigating a minefield of potential chambering issues. Cases that are ever-so-slightly out of spec can lead to frustrating stoppages, turning a satisfying range day into a troubleshooting session. This is precisely the scenario that led me to seek out a specialized solution, and after considerable research, the RCBS Small Base Taper Crimp Die Set – AR Series emerged as a highly promising candidate. My initial impression upon receiving the set was one of solid craftsmanship; the dies felt substantial, machined to what appeared to be exacting tolerances, and the packaging, a simple but effective black die box, spoke of a no-nonsense approach to tool manufacturing. While I briefly considered other brands known for their reloading components, the specific design features targeting AR-style feeding problems, as highlighted in product descriptions, tipped the scales decisively in RCBS’s favor. This set offered a tangible sense of potential relief from the nagging worries of inconsistent chambering.

Real-World Testing: Putting RCBS Small Base Taper Crimp Die Set – AR Series to the Test

First Use Experience

My initial testing grounds were my reloading bench and then, crucially, the shooting range. I paired these dies with my .300 Blackout AR pistol, a platform notorious for its sensitivity to case dimensions and bullet runout, especially with lighter, faster-twist barrels. The RCBS set was intuitive from the start; the instructions were clear, and the familiar feel of RCBS quality made the transition from my standard dies seamless.

During the first reloading session, I processed a batch of once-fired brass. The small base sizing die immediately felt more robust, resizing the case back to slightly smaller dimensions than a standard die, which is critical for ensuring reliable ejection and chambering in AR-style rifles. The taper crimp die then did its job, providing a clean, consistent crimp without excessive force. On the range, the reloaded cartridges fed and ejected flawlessly through my AR pistol. I fired approximately 50 rounds from this initial batch without a single hiccup, a marked improvement over some previous experiences with other die sets where I’d occasionally encounter a sticky chamber. The unique 7-degree crimp angle designed for autoloading rifles seemed to be effectively securing the bullet, preventing any movement during recoil.

Extended Use & Reliability

After several months and hundreds of reloaded rounds through various AR platforms, including a 5.56/.223 build and another .300 Blackout rifle, the RCBS Small Base Taper Crimp Die Set – AR Series has proven its mettle. The dies continue to perform consistently, with no noticeable degradation in their ability to size cases or crimp bullets. I’ve subjected them to the usual workshop conditions – dust, occasional lubricant residue, and consistent use – and they show no signs of wear or reduced performance.

Maintenance has been straightforward; a quick wipe-down with a dry cloth after use and a light application of lubricant on the threads before storage is all that’s needed. I did drop one of the dies on my concrete shop floor during a moment of distraction, and while it thankfully didn’t crack, it did acquire a small scuff mark. This incident, however, didn’t impact its functionality whatsoever, reinforcing the robust build quality. Compared to previous experiences with generic dies or even some premium brands that occasionally exhibit slight variations in resizing, these RCBS dies maintain their precision batch after batch.

Breaking Down the Features of RCBS Small Base Taper Crimp Die Set – AR Series

Specifications

The RCBS Small Base Taper Crimp Die Set – AR Series is designed to address specific challenges in reloading for semi-automatic rifles. The manufacturer, RCBS, has engineered this set with a focus on reliability and proper cartridge feeding in platforms like the AR-15. Each set contains a precisely machined Small Base Size Die and a Taper Crimp Seat Die, typically sold as a two-die set in a protective black die box.

The Small Base Size Die is the cornerstone of this set. It resizes fired cases to a diameter that is slightly smaller than standard full-length sizing dies. This ensures that cartridges will reliably chamber and eject, especially in firearms with tight tolerances, which are common in AR-style rifles. The Taper Crimp Seat Die then applies a gentle, uniform taper crimp to the bullet.

This unique taper crimp is specifically angled at a 7-degree crimp angle. This precise angle is crucial for securing the bullet firmly within the case, preventing it from shifting forward or backward due to the recoil generated by semi-automatic fire. Bullet movement can lead to dangerous pressure spikes or feeding issues.

The dies are constructed from hardened steel, a material known for its durability and resistance to wear. This ensures a long service life, even under frequent use. The overall construction adheres to RCBS’s reputation for machining to exacting tolerances, a hallmark of their reloading tools. The country of origin for these dies is the USA, often a point of pride for consumers seeking domestically manufactured quality.

Performance & Functionality

The core job of the RCBS Small Base Taper Crimp Die Set – AR Series is to ensure reloaded ammunition functions flawlessly in semi-automatic rifles, and it excels at this. The primary strength lies in the small base sizing die. Its ability to reduce case diameter sufficiently for reliable chambering in AR platforms is undeniable. I’ve consistently experienced smoother bolt cycling and fewer extraction issues since integrating these dies into my reloading process.

The taper crimp die, with its specialized 7-degree crimp angle, performs admirably in securing bullets. This is particularly important for cartridges like the .300 Blackout, which often use heavier bullets that can be prone to setback under recoil. The crimp applied is firm enough to prevent bullet movement but gentle enough to avoid damaging the bullet jacket or distorting the case mouth excessively.

While the performance is excellent for its intended purpose, it’s important to manage expectations. These dies are specifically for AR-style firearms or other semi-automatics that require a tighter case fit. For bolt-action rifles with more generous chamber dimensions, a standard full-length sizing die might be perfectly adequate, and in some cases, preferred for maximum case life. However, for the AR user, the functionality is unparalleled.

Design & Ergonomics

The design of the RCBS Small Base Taper Crimp Die Set – AR Series is undeniably functional and utilitarian. These are tools meant to perform a critical task, and their aesthetic reflects that. The hardened steel construction gives them a satisfying heft and suggests a tool built to last for decades. The finish is typically a durable, utilitarian silver or blued surface that resists minor scratches and corrosion.

Ergonomically, reloading dies are designed to be held and manipulated by hand on a reloading press. The knurled sections on the dies provide adequate grip for tightening and adjusting them. There’s no complex learning curve; if you’re familiar with using reloading dies, these will feel immediately comfortable. The precise machining means they thread smoothly into most standard reloading presses without binding.

A practical design element is the included black die box. While seemingly minor, this protects the dies from dust and damage when not in use, keeping them organized and ready for the next reloading session. The clear labeling on the dies themselves, indicating their function (Small Base, Taper Crimp), is also a welcome practical touch.

Durability & Maintenance

The hardened steel construction of the RCBS Small Base Taper Crimp Die Set – AR Series points towards excellent long-term durability. For their intended purpose, which involves repeated resizing and crimping actions on brass cases, these dies should last for thousands, if not tens of thousands, of rounds. The precise machining ensures that critical dimensions are maintained over time, preventing the loss of accuracy or functionality.

Maintenance is refreshingly simple. A light wipe-down with a clean, dry cloth after each use is generally sufficient to remove any residual brass shavings or case lube. Occasionally, applying a very small amount of quality gun oil or specialized reloading die lubricant to the threads can ensure smooth operation and prevent galling, especially if the dies are frequently removed and reinstalled.

Potential failure points are minimal. The primary concern would be thread damage if a die is cross-threaded into the press, or damage from extreme impact, as I inadvertently discovered. However, the core machining and internal components are robust. Unlike some consumables, these dies are a long-term investment in consistent reloading quality.

Accessories and Customization Options

This particular die set, the RCBS Small Base Taper Crimp Die Set – AR Series, is typically sold as a two-die set. This means the primary components for resizing and crimping are included. The set comes packaged in a protective black die box, which serves as its main accessory, keeping the dies organized and safe.

There are generally no specific “accessories” that come with these dies in the way a flashlight might include different batteries or a tactical knife might come with a sheath. The customization options are also limited by their nature as reloading dies. However, some reloaders might choose to purchase an additional RCBS T/C Seater Die if they prefer a dedicated seating die separate from the crimp die, as one user noted.

The dies are manufactured to standard 7/8″-14 thread dimensions, making them compatible with virtually all standard reloading presses on the market. This universal threading ensures that users can easily integrate these RCBS dies into their existing setup without needing specialized adapters or presses.

Pros and Cons of RCBS Small Base Taper Crimp Die Set – AR Series

Who Should Buy RCBS Small Base Taper Crimp Die Set – AR Series?

This die set is an absolute must-have for any handloader who frequently reloads ammunition for AR-platform rifles, whether they are chambered in 5.56/.223 Remington, .300 Blackout, or other common AR calibers. If you’ve ever experienced frustrating chambering failures, bolt overrides, or extraction issues with your reloaded rounds in these firearms, then this set is engineered to solve those problems. It’s ideal for both experienced reloaders looking to refine their process for semi-automatics and those newer to reloading who want to ensure their AR ammo feeds reliably from the start.

However, if your primary firearm is a bolt-action rifle with a more forgiving chamber, or if you only reload for pistols, you likely won’t need the specialized features of this RCBS set. A standard full-length sizing die and a seater/crimper combo die will likely serve your needs adequately and more cost-effectively. For those embracing the AR platform, I would strongly recommend pairing these dies with a quality case prep tool and a reliable case lubricant to maximize efficiency and case life.

Conclusion on RCBS Small Base Taper Crimp Die Set – AR Series

The RCBS Small Base Taper Crimp Die Set – AR Series is, quite simply, a precision tool that effectively addresses a common pain point for AR rifle reloaders. The thoughtful engineering behind the small base sizing die and the specialized taper crimp function with its 7-degree crimp angle ensures that reloaded ammunition chambers and feeds with a reliability that standard dies often struggle to achieve in these platforms. The build quality is, as expected from RCBS, superb; these dies are machined to tight tolerances from hardened steel, promising years of faithful service. While they are a specialized tool, their performance in their intended application is so strong that they easily justify their price for anyone serious about consistent, problem-free reloading for their semi-automatic rifles. I wholeheartedly recommend this die set to any AR enthusiast looking to eliminate chambering worries and enjoy a smoother, more reliable shooting experience.