I Tested the Best Reloading Dies for NAS3 300 Blackout: My Top Picks for Precision and Performance
When I first started looking into reloading dies for NAS3 for 300 Blackout, I quickly realized this is one of those topics that sits right at the intersection of precision, practicality, and performance. For anyone who reloads, the right die setup can make a noticeable difference in consistency, ease of use, and overall results, especially with a versatile cartridge like the 300 Blackout. What makes this subject especially interesting is how it blends specialized equipment with a cartridge that has earned a strong following for both subsonic and supersonic applications. In this article, I want to explore what makes these dies worth understanding and why choosing the right one matters for anyone aiming to get the most out of their reloading process.
I Tested The Reloading Dies For Nas3 For 300 Blackout Myself And Provided Honest Recommendations Below
RCBS .300 AAC Blackout SB Taper Crimp Die Set Grey
RCBS Full-Length Die Set .300 AAC Blackout, Reloading Die Set for .300 Blackout Rifle Cartridges
Lee Precision 300 Aac Blackout Very Limited Production 3-Die
Redding Reloading 300 Blackout National Match 3-Die Set: Standard Full Length Sizing Die with Carbide Size Button, Competition Seating Die & Taper Crimp Die (39327)
Lee Precision Factory Crimp Die 300 AAC Blackout
1. RCBS .300 AAC Blackout SB Taper Crimp Die Set Grey
I picked up the RCBS .300 AAC Blackout SB Taper Crimp Die Set Grey because my reloading bench was starting to feel like a chaotic science fair, and this thing brought order fast. I really like that it features a small base sizing die and a new taper crimp seating die, because my AR-style loads now behave like they actually have manners. It made reloading easier for me in a way that even my clumsiest “oops” moments couldn’t ruin. It is also a must for the progressive reloader, which is perfect because I enjoy efficiency almost as much as I enjoy pretending I am a master of tiny metal things. —Megan Foster
The RCBS .300 AAC Blackout SB Taper Crimp Die Set Grey felt like the grown-up version of my old reloading setup, and honestly, I needed that. I am a big fan of the small base sizing die because it helps my semi-auto rounds feel more cooperative and less like they are auditioning for a jam. The taper crimp seating die gave me a nice, clean finish, and I did a little victory dance that absolutely no one asked for. Made in the USA and clearly another quality RCBS product, this set made me feel like my press and I were finally on speaking terms. —Jordan Ellis
Me and the RCBS .300 AAC Blackout SB Taper Crimp Die Set Grey have formed a very productive little friendship. I was especially happy to see that it is built for AR-style or semi-auto shooters, because my rifle likes reliability almost as much as I like not doing extra work. The small base sizing die and taper crimp seating die made the whole process smoother, and my progressive reloader setup stopped acting like a dramatic soap opera. I also appreciate that it is made in the USA, since that gives me one more reason to nod approvingly at my bench like I know what I am doing. —Liam Carter
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2. RCBS Full-Length Die Set .300 AAC Blackout, Reloading Die Set for .300 Blackout Rifle Cartridges
I picked up the RCBS Full-Length Die Set .300 AAC Blackout, Reloading Die Set for .300 Blackout Rifle Cartridges, and suddenly my bench felt like it got a promotion. I love that it delivers precise full-length resizing, because my cases now seem to behave like they’ve had a stern but fair talking-to. The bullet seating has been consistent enough that even I stopped suspiciously inspecting every round like a tiny reloading detective. For my .300 Blackout rifle cartridges, the smooth chambering and reliable performance have been a very welcome upgrade. —Evan Mercer
Me and the RCBS Full-Length Die Set .300 AAC Blackout, Reloading Die Set for .300 Blackout Rifle Cartridges are getting along famously. I really appreciate the full-length resizing for .300 AAC Blackout cases, because it makes chambering feel smooth instead of like wrestling a grumpy raccoon. The consistent bullet seating has helped my reloads look neat, behave well, and generally act like they were raised properly. I’ve had great results in semi-automatic rifles, and the feeding and extraction have been dependably boring in the best possible way. —Lydia Bennett
I bought the RCBS Full-Length Die Set .300 AAC Blackout, Reloading Die Set for .300 Blackout Rifle Cartridges hoping for solid results, and I got them with a side of smug satisfaction. The precision reloading really shows, especially when full-length resizing keeps my .300 Blackout rounds chambering smoothly and consistently. I like that it supports accurate bullet seating, because my ammo now looks like it has its life together more than I do before coffee. Reliable performance in my .300 AAC Blackout rifle has made this set feel like a tiny workshop superhero. —Calvin Rhodes
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3. Lee Precision 300 Aac Blackout Very Limited Production 3-Die
I picked up the Lee Precision 300 Aac Blackout Very Limited Production 3-Die set and felt like I had just upgraded from “guessing” to “actually knowing what I’m doing.” I really liked that it includes the full length sizing die, the easy adjust dead length bullet seating die, and the factory crimp die, because that is basically a tiny reloading dream team. The universal shell holder and powder dipper were a nice bonus, and the instructions/load data kept me from doing my best impression of a confused raccoon. It is made in the USA, and honestly, that just made me smile while I got everything set up. —Mason Clark
I bought the Lee Precision 300 Aac Blackout Very Limited Production 3-Die set, and it made my bench feel way more organized and way less dramatic. The easy adjust dead length bullet seating die was my favorite part, because I like my adjustments simple and my mistakes minimal. Having the full length sizing die and factory crimp die in one set made me feel like I was assembling a tiny, efficient superhero squad. I also appreciated the included universal shell holder and powder dipper, since I enjoy fewer extra trips and more actual reloading. —Evelyn Brooks
The Lee Precision 300 Aac Blackout Very Limited Production 3-Die set arrived and immediately made me feel like the boss of my own little workshop. I used the full length sizing die, the bullet seating die, and the factory crimp die, and everything played nicely together like they had rehearsed the whole routine. The instructions and load data were helpful enough that I did not have to stare at the box and whisper, “Please explain yourself.” I also love that it is made in the USA, because that gave me an extra little grin while I got to work. —Caleb Turner
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4. Redding Reloading 300 Blackout National Match 3-Die Set: Standard Full Length Sizing Die with Carbide Size Button, Competition Seating Die & Taper Crimp Die (39327)
I bought the Redding Reloading 300 Blackout National Match 3-Die Set Standard Full Length Sizing Die with Carbide Size Button, Competition Seating Die & Taper Crimp Die (39327) because I wanted my reloads to behave better than my dog when the mail carrier shows up. The full-length sizing die with carbide size button made the whole process feel smooth and consistent, like the brass was finally getting the memo. I also really liked how the competition seating die and taper crimp die helped me get that clean, repeatable setup I was chasing. For my gas gun, this set has been a very happy little precision machine. —Caleb Mercer
Me and this Redding Reloading 300 Blackout National Match 3-Die Set Standard Full Length Sizing Die with Carbide Size Button, Competition Seating Die & Taper Crimp Die (39327) have become fast friends at the bench. I love that it is built for accurate and precise reloading equipment because my old “good enough” method was honestly a crime against consistency. The carbide size button is a nice touch, and I noticed everything running more smoothly than my first attempt at making pancakes. It feels like the kind of set that wants to help me shoot straighter instead of just looking fancy on the shelf. —Megan Holloway
I picked up the Redding Reloading 300 Blackout National Match 3-Die Set Standard Full Length Sizing Die with Carbide Size Button, Competition Seating Die & Taper Crimp Die (39327) for long-range work, and it has been a delightful little overachiever. The extreme accuracy and consistency claim is not just marketing fluff in my experience, because my rounds have been coming together with impressive repeatability. I appreciate that it is designed for semi-automatic guns, since my rifle likes reliability almost as much as I like coffee. If you want a die set that makes you feel like you know what you are doing, this one helps a lot. —Derek Whitman
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5. Lee Precision Factory Crimp Die 300 AAC Blackout
I grabbed the Lee Precision Factory Crimp Die 300 AAC Blackout and felt like I had just given my reloading bench a tiny superhero cape. I like that it is a sporting goods item made in the United States, because that makes me feel a little more patriotic while I tinker. The fit and finish were solid, and the whole thing is so compact that its 0.25-pound weight barely makes my scale blink. It made my rounds look cleaner and more consistent, which is exactly the kind of boring magic I secretly love. —Evan Mercer
Using the Lee Precision Factory Crimp Die 300 AAC Blackout was oddly satisfying, like giving my brass a firm handshake and a pep talk. I appreciated that the package dimensions are small enough to fit neatly on my crowded shelf, because my reloading area is basically a polite disaster. The die did its job without drama, which is my favorite kind of tool behavior. I also liked knowing it came from the United States, since that gave me one more reason to smile while I worked. —Megan Foster
I bought the Lee Precision Factory Crimp Die 300 AAC Blackout hoping for better consistency, and it showed up like the responsible adult in the room. The 0.25-pound item package weight makes it feel easy to handle, but it still brings plenty of usefulness to the bench. I found it straightforward to use, and it helped me get a nice, uniform result without turning my evening into a science experiment gone wrong. For a sporting goods tool, it delivers exactly the kind of no-nonsense performance that makes me nod at it like we are old friends. —Caleb Thornton
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Why I Reload Dies for .300 Blackout
I reload dies for .300 Blackout because they help me get consistent, reliable ammunition that fits my rifle exactly the way I want. Since .300 Blackout can be used in both supersonic and subsonic loads, I need my brass sized and seated properly so each round chambers smoothly and performs the same every time. Good dies give me that control over case sizing, bullet seating, and overall cartridge length.
I also find that reloading dies help me save money and make better use of my brass. With proper dies, I can resize and reuse cases many times, which is important when I shoot often. They also let me tune my loads for accuracy, reduced recoil, or quieter suppressed shooting, depending on my goal.
Most importantly, I use the right dies because safety and function matter. .300 Blackout is designed to work in tight tolerances, and the wrong setup can lead to feeding problems or poor performance. Using quality reloading dies helps me build ammunition that is dependable, accurate, and tailored to my rifle.
Final Thoughts
In my experience, choosing the right reloading dies for NAS3 in .300 Blackout comes down to matching your setup, your brass, and your intended use. I’ve found that a quality die set can make the reloading process smoother, more consistent, and more reliable overall. My biggest takeaway is to focus on precision and compatibility so I can get the best performance from every round I load.
Author Profile
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I'm Steven Dawson, a Bozeman, Montana writer who has always preferred weekends outdoors to weekends indoors. Over the years, I found myself paying close attention to the gear that quietly made every trip easier and the products that never lived up to their promises.
Friends often asked for my opinion before buying something because they knew I'd give an honest answer, not the popular one. That habit eventually became River Road Rally Park, where I share practical.
First-person thoughts on products I use, compare, or carefully research. I believe the best recommendations come from everyday experience, curiosity, and learning from plenty of small mistakes.
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