Those, of course, were loaded to just as supersonic as I could get them! I have launched many, many A-MAX bullets at distant targets. 300 Blackout 208-Grain A-MAX® Hornady BLACK®. That combination of needs means that subsonic usually has a ballpark 200-grain bullet.
Additionally, there has to be enough pressure to function the gun, but not exceed the velocity limit. To be subsonic, muzzle velocity limit is just over 1000 feet per second (fps). These each also show the two essential approaches to subsonic blackout. There are not nearly as many options shopping for subsonic factory ammo, and I chose to evaluate two from the same manufacturer.
I got interested in subsonic Blackout after finishing a project for my last book, and that was building a specialized home defense gun. 300 Blackout? The object of my attention and the motivation for this article: my “house gun,” a purpose-built. Technically, Blackout can be a little higher pressure, which mostly only affects supersonic loadings.) Why. Advanced Armament Corporation secured production-cartridge status, which means it got SAAMI-certified and called it. The main distinction is only a formality. (By the way, there’s no real difference in. If it functions with subsonic, it will greatly “over-function” with higher-pressure supersonic. 308-caliber bullet doesn’t produce much gas to operate the system.Īnd, clearly, it’s not possible to run sub- and supersonic loads through the same gun without undue compromise. One revolution every 9 inches "One in Nine" 1/9 45-75 grainsI’ll do another entire article on that topic in these pages later on this year, but the reason is that the small amount of fast-burning propellant needed to launch a relatively heavy. One revolution every 8 inches "One in Eight" 1/8 50-80 grains One revolution every 7 inches "One in Seven" 1/7 55-85 grains Twist rate Spoken pronunciation Written notation Bullet weight stabilization The higher the weight, the longer the bullet, and the faster the twist rate. Below is a listing of the twist rates and bullet range that they can stabilize :ĭue to the constant diameter inside the barrel and the fact that most bullets are manufactured with the same components, the best way to determine the proper twist rate is based on the weight of the bullet (measured in grains). It is a hit and miss and you won't know until you try different loads.
#THE MAXIMUM AMOUNT OF FPS FOR A SUBSONIC ROUNDS CRACK#
The heavier bullet might eliminate the sonic crack but the twist on your rifle may not be able to stabilize the bullet to provide you with the accuracy you would like to have. Unfortunately the 1:9 twist rate will stabilize the lighter bullets which have velocities much higher than the 1100 rounds, so you might still hear a sonic crack with a supressor. Suppressors work great with subsonic rounds of 1100 fps or less. Look at it this way, if the minimum safe load you can shoot a bullet for your caliber exceeds 1100 fps the supressor may not be as quiet as you might think.
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