This article was originally posted on Thefirearmblog.com
SAAMI has published drawings of three newly standardized cartridges. As mentioned in the title, these are the .224 Valkyrie, 6mm Creedmoore and .24 Nosler. Let’s take a look at each of these cartridge drawings.
One of the most obvious trends of SHOT Show 2018 was the introduction of many new bolt-action rifles and AR-15s chambered in .224 Valkyrie. I believe there were more than 10 new rifles in this caliber. I think it is safe to say that the .224 Valkyrie is a commercial success. That being said, it was just a matter of time until this new cartridge became SAAMI standardized.
In order to download the full SAAMI drawing for the .224 Valkyrie cartridge, click here.
This cartridge was introduced in fall 2016. It is basically made by necking down the popular 6.5mm Creedmoor cartridge to .243 caliber. This relatively new cartridge is already quite popular among long-range shooters. It is capable of being loaded with a wide variety of 6mm (.243) projectiles and providing impressive ballistic numbers. According to Sierra load data published earlier on TFB, this cartridge can launch 55 gr bullets at over 4,000 fps of muzzle velocity and twice as heavy 110 gr ones pass the 3,000 fps threshold. Click here to download the complete SAAMI drawing of 6mm Creedmoor cartridge.
As in the case of the .20 Nosler cartridge that was SAAMI standardized about a year ago, the 24 Nosler doesn’t actually exist yet. Right now the new Nosler family of cartridges includes the .22 Nosler, .26 Nosler, .28 Nosler, .30 Nosler and .33 Nosler cartridges. These are .224, .264, .284, .308 and .338 caliber cartridges respectively. Using the same two-digit designation system, they named this new SAAMI standardized cartridge .24 Nosler. As you can see in the above drawing, it is a .243 caliber (6mm) cartridge with a rebated rim to .223 Remington rim size and an overall length of 2.26″ meaning that it is designed with the intention of being loaded in AR-15 size magazines. It is certainly based on the .22 Nosler case, but it’s not a necked up .22 Nosler. The shoulder is pushed back and it has a shorter case length giving it 2.7 calibers of space over the case.
If one tries to neck down this cartridge to .224 caliber, then it should become identical to .224 Valkyrie in terms of the case length, case capacity and overall length with the exception (or maybe advantage) of having a .223 Remington rim.
You can download the spec sheet for this cartridge by clicking here.
Images from www.SAAMI.org