Accurate 2230 and Accurate 2460 are arguably better Velocity and Case fill than Benchmark or AR Comp, but they are simply not as accurate as Benchmark in our thorough testing. This is where Benchmark starts to run away with the title. You can put 27 grains, for example, in a 50 grain bullet, loaded to NATO pressures, but you cannot do this with Benchmark or AR Comp because those powders start overflowing the case when you get near ~25.5-26 grains depending on what case you are using. Accurate 2230, since it is a small grain ball powder, as well as Accurate 2460, have better case fill characteristics than Benchmark or AR Comp. Benchmark is like the "perfect" fill in the case, with almost every bullet you can put in the rifle, that is 50-77 grains. And using 60 grain V-MAX, 60 grain Berger and 62 grain bullets, it still liked 24.5-25 grains of powder, which we think is still under or near max load and lights out accurate. And you would not use 25.5 grains of powder with a 55 grain bullet, because it is far more accurate and great velocity using 25.0 grains, across every gun I ever tested, every 55 grain bullet. Benchmark, using a 55 grain bullet would slightly need compression, but no big deal at all, when you use max charges of near 25.5 Grains. This is why we only tested like 30+ different powders, because many could be used, but why? When you can use 30 that are better suited? Here are the criteria we used to say what is the best: The powders with medium burn rate in the 5.56 range, such as Benchmark, H335, AA2230, AA2460, TAC, Power Pro Varmint, are better "overall" choices for wider range between 50-77 grain. Just like Precision Rifle and Varget can work for 55 grain bullets, they are not very good for that weight, and best suited for 69 grain and ABOVE in weight. Reloader 10x, or N130 might be good for say 40-50 Grain bullets, but above that, too fast. But the super super fast powders and the super slow powders in the range, although can work in 5.56 in "some" ways, they are not designed to work in all weight bullets, and thus, are recommended for different loads. Before we get into it, we just want to say, that one can "use" almost any powder for 5.56 and make it "work" all the way from N130 or Reloader 10x, which are on fast side, to the far other side, which would be SW Precision Rifle, Varget, RL15 or Alliant Power Pro 2000-MR. We have the basis now to discuss what makes a powder good for 5.56. What makes a powder stand out and overall "best"? Here is how we define "best", and this is no industry standard, this is just what we think, after basically using about ~30 different powders in 5.56. Lets discuss why this powder is stand out in the 5.56 world.
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