![]() The powders used for this article didn’t show much difference between “pistol gas,” and “carbine gas.” In brief, the powders used for this article required the adjustable gas block screws to be turned out four full turns on the Loki to cycle subsonic loads. With select loads this rifle prints 0.75-MOA five-shot groups at 100 yards, so I added it to my collection. It was built with a Satern button-rifled barrel with the gas block in the carbine position. Now-defunct Loki Weapons Systems built a Patrol Rifle with an adjustable gas block in 300 BLK for an article I wrote several years ago. Every load and weapon combination won’t fit in the allotted space for this article, so I’ll focus on a select few loads from a couple of rifles. Over the past several years I have worked up loads for no fewer than 10 different direct impingement ARs chambered in 300 Fireball/.300 Whisper/300 BLK. This comes in handy when switching from subsonics to high-velocity loads. ![]() I have learned that an adjustable gas block allows “tuning” the amount of gas that operates the weapon through extensive testing over the years, shooting 300 BLK from a DI AR. Loads need to average 100 fps slower to assure subsonic launch, and stay “whisper” quiet. It’s not enough to keep velocities below the 1,080 fps threshold at sea level when loading subsonic rounds they will still be too fast to keep noise at acceptable levels when using a suppressor. Other considerations come into play when loading for the 300 BLK. Other firearms manufacturers believe that an adjustable gas block at the carbine position will address the issue, while others believe that an adjustable gas block in the pistol position is the answer. AAC’s thoughts on the matter center on using a non-adjustable carbine-position gas block, and finding powders that perform well with that gas block’s position. Reloading 300 Blackout: Feeling The PressureĪnother issue associated with this cartridge is how much pressure is needed to cycle a direct gas impingement system without “over gassing.” This comes into play when considering the use of fast-burning powders that expend their gas energy in the first few inches of the barrel. Finding cheap military 5.56mm NATO brass to cut down for 300 BLK ammo is much easier than necking up. The longer throat allows the safe use of trimmed and sized 5.56mm NATO brass without the malfunctions associated with thicker-walled brass. 300 Whisper with a longer chamber throat lead. To that end, we’re providing a few favorite loads you may wish to try yourself.īasically, the 300 AAC Blackout (300 BLK) is a. ![]() Handloading is a prime option to feed your 300 Blackout and save some money. Since the 300 Blackout’s production is still a fraction of 5.56 NATO ammunition, though, its price is relatively high in comparison. Popularity of the 300 AAC Blackout continues to track upward as Remington’s capacity to produce factory fodder caught up with demand for this reborn cartridge. The DoubleStar AR was the test bed for CFE BLK powder, which should be a great performer in most 300 BLK ARs.
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