![]() ![]() 300 AAC Blackout/.300 Whisper: This is a caliber that was designed by JD Jones of SSK Industries back in the early 1990s, based on the. Factory loads are available with bullets weighing between 24 grains and 45 grains, and reloaders have bullets available from 24 grains up to 55 grains. The Hornady 32 grain V-Max load generates 4225 feet per second. It is primarily a varmint hunting round where speed and flat trajectory are more important than bullet mass. 20 caliber round developed by Ruger in cooperation with Hornady in 2003. With the correct bullet choice you can use it for varmint hunting, predator hunting, deer, hog, and elk hunting, personal defense, and of course target/competition shooting all at distances farther than any of the other AR-15 chamberings, and with better ballistics when the bullet arrives on target. This is one of the best all-around multipurpose cartridges you can put in an AR-15. Factory ammunition is loaded with bullets weighing between 90 grains up to 130 grains, and reloaders have the use of bullets weighing from 85 grains up to 156 grains. ![]() It was designed to be a 200-800 yard cartridge that could still be magazine fed in a standard length AR-15 magazine, while having superior ballistics to the standard. 264 LBC): The Grendel was designed by Bill Alexander and Janne Pohjoispää in 2002-2003, and adopted by SAAMI in 2011. 223 Remington loads when used in a chamber that can safely shoot 5.56x45mm NATO also.Ħ.5 Grendel (also known as 6.5×39, and. ![]() 223 Wylde chamber that is a combination of the two to try and enhance accuracy of the. 223 Remington chamber, the longer throated 5.56x45mm NATO chambering, and the “hybrid”. There are several ways the barrels are chambered, the normal. Depending on your barrels twist and bullet choice, it is a viable choice for varmint hunting, predator hunting, deer hunting (depending on your states laws), defensive use, and target/competition use. 223 Remington/5.56x45mm NATO: The caliber that started it all for the AR platform, a very useful cartridge with bullet weights available in loaded ammo from 35 grains up to 77 grains, and component bullets available from 33 grains up to 90 grains. Here are the rifle calibers that are currently available, considered mainstream, and have SAAMI adopted standards with factory ammunition available for them. There could be some I missed, and I didn’t include any rimfire options that have been made either, but thats the majority of the ones that have been made or are being made. Here is a quick list of the centerfire calibers that the AR-15 has been chambered in over the years as either factory offerings or as wildcats based on other calibers offered that will feed from magazines as designed. I am not going to get into ALL of the different chamberings that the rifle has been chambered in, but am going to list the majority of them and then talk a bit about the mainstream SAAMI chamberings available today that have factory ammunition available for them and barrels available from more than one company. 223 Remington cartridge, which is dimensionally identical to the 5.56x45mm cartridge with a slightly modified chamber throat and loaded to marginally lower pressures.īut, as with all things firearms related in the United States, folks started to tinker with the AR-15 to change its chamberings and enhance its capabilities towards specific tasks. The AR-15 firearm was initially released by Colt in the. ![]()
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