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The .300 Whisper (7.82x34mm) is a CIP standard [1] cartridge in the Whisper family, a group of cartridges developed in the early 1990s by J.D. Jones of SSK Industries.It was developed as a multi-purpose cartridge, capable of utilizing relatively lightweight bullets at supersonic velocities as well as heavier bullets (200–250 grains) at subsonic velocities.
In order to sidestep this branding and/or avoid licensing fees required to use the "Whisper" name legally, other manufacturers tend to use different names for cartridges in the Whisper family. For example, the .300 Whisper, the most popular cartridge of the family, is often called .300 AAC Blackout, ".300 AAC", ".300 Fireball", ".300 warrior ...
The .300 AAC Blackout is a SAAMI-standardized .300-221. Hornady states that any rifle chambered for the 300 AAC Blackout can shoot their .300 Whisper ammunition, which is made within .300 AAC Blackout specs. The reloading dies for these two cartridges are often the same. [7]
Alternatively, specialized firearms and ammunition may be used to optimize total subsonic ammunition effectiveness. These are designed from the start as dedicated subsonic projectile systems. Some examples include .300 Whisper, 300 AAC Blackout, .338 Whisper, 8.6mm Blackout, 9×39mm, 12.7×55mm STs-130, .500 Whisper, and .510 Whisper.
.300 Precision Rifle Cartridge.300-221.300 AAC Blackout.300 H&H Magnum.300 Blaser Magnum.300 ICL Grizzly.300 Lapua Magnum.300 Norma Magnum.300 Remington Short Action Ultra Magnum.300 Remington Ultra Magnum.300 Rook.300 Ruger Compact Magnum.300 Savage.300 Sherwood.300 Weatherby Magnum.300 Whisper.300 Winchester Magnum.300 Winchester Short Magnum
The cartridge that the 277 Wolverine is most often compared to is the 300 AAC Blackout, with each having its strengths and limitations. Although the 300 BLK has recently grown in popularity with civilians, it was initially created as a SAAMI-approved subsonic cartridge for the US military.
.300 AAC Blackout, rifle cartridge.300 Winchester Magnum, rifle cartridge.300 Remington Ultra Magnum, rifle cartridge.300 Winchester Short Magnum, rifle cartridge.300 Whisper, subsonic rifle cartridge.300 Lapua Magnum, rifle cartridge.300 Savage, rifle cartridge.300 Weatherby Magnum, rifle cartridge.300 Norma Magnum, rifle cartridge.300 H&H ...
8.6mm Blackout (8.6×43 mm), also sometimes referred to as 8.6 BLK, [1] is a centerfire rifle cartridge developed by the firearms manufacturer Q, LLC. [6] It utilizes a shortened case from the 6.5mm Creedmoor necked up to an 8.6 mm caliber (8.585 mm or 0.338 in diameter) projectile. 8.6 Blackout is designed for use in bolt-action rifles or as a caliber conversion for AR-10 style rifles.