22 LR shooters have the wisest variety of subsonic options, with loads from just about every manufacturer. 308 bolt action is perfect for subsonics, but if you use them in a standard AR-10 they will be quiet, but you must cycle the action manually for every shot. Finally, understand that unless designed to function specifically with subsonics, many semi-autos will not cycle if the ammunition is simply loaded down. 460 end cap on the same suppressor with the same load and it’s much louder. For example, a 200 grain, 10mm subsonic load is very quiet with the correct end cap. An under-pressured subsonic cartridge may sometimes not quiet down well in an over-bored suppressor. 223), and they work great with supersonic loads, but a cartridge must generate enough gas pressure to pressurize the can in order to slow and quiet the gasses down. It’s common to use an over-bored suppressor (think. Another thing to consider is the suppressor itself. A few shots through paper are an easy way to verify stabilization. This can cause a baffle strike, causing serious injury and damage. Subsonic loads typically use heavier bullets that may not stabilize with some slower-twist barrels. The most important, is to verify that your gun is stabilizing the subsonic bullets before shooting them through a suppressor. If you’re dipping your toes into the world of suppressors and subsonics for the first time, there are a few things to be aware of when selecting your gun, cartridge, and suppressor. A bullet traveling below the speed of sound does not make that distinct sonic crack. At speeds above the sound barrier, the bullet itself creates a sonic boom, or in the case of bullets, a high-pitched crack, perceptible all along its flight path. Quite simply, subsonic ammunition is any cartridge that propels its projectile at a velocity that is below the speed of sound-approximately 1100 fps depending on atmospheric conditions and elevation. Here are 10 things everyone should know about subsonics. So the time has come to try and clear up any confusion. There is plenty of misunderstanding about subsonics, what they do, and how you should use them. I’m referring to ammunition specifically crafted as subsonic, to be paired with rifles outfitted with a suppressor. Hand-in-hand with what could be called the suppressor enlightenment in the United States over the past decade, comes the rise of subsonic ammunition. LilGun seems to be a good powder for a variety of 300 BLK loads matched to specific optics, but I would be interested in seeing if anyone works up some good loads for this bullet with the recently announced Hodgdon CFE BLK powder.We may earn revenue from the products available on this page and participate in affiliate programs. All of the loads are recommended to be fired from guns with a 1:10″ or faster twist rate. Data for Accurate #1680, Hodgdon 4198, Hodgdon H110 and Hodgdon LilGun are included. With a 16″ barrel, each of the recipes provides a velocity of 1,050 – 1,100 fps. Lehigh Defense provides load data for four different 300 BLK recipes. The center piece also forms a wound channel. Once expansion begins, three pre-stressed petals peel back and break off while the core continues to provide deep penetration. Inside the hollow point is a sabot-like piece of metal. The bullet has a large hollow point cavity. ![]() This is a specific way that the bullets are made so they will reliably expand after a predetermined penetration depth. According to Lehigh Defense, the bullet employs the company’s Controlled Fracturing Technology.
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