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The Whisper family was developed as a line of accurate, multi-purpose cartridges using relatively heavy rifle bullets for a given caliber in subsonic loads. [1] [2] [3] The intention was to create an extremely accurate cartridge family for military, police, competition and specialized hunting markets that could also be easily sound suppressed.
Subsonic ammunition is ammunition designed to operate at velocities below the speed of sound (Mach 1), which at standard conditions is 340.29 m/s (1,116.4 ft/s). This avoids the supersonic shockwave or "crack" of a supersonic bullet, which, particularly for suppressed firearms, influences the loudness of the shot.
The DSR-1 Subsonic is a variant optimized for 7.62×51mm NATO/.308 Winchester subsonic ammunition usage. The barrel length is reduced to 310 mm. The barrel length is reduced to 310 mm. The 8 inch twist rate of the barrel is especially adapted to stabilize the long heavy projectiles used in subsonic ammunition.
8.6mm Blackout (8.6×43 mm), 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.
The .308×1.5" Barnes was intended as a short range deer cartridge that could also be used as a varmint and predator cartridge. Loaded with the 150 gr (9.7 g) cartridge, it is capable of taking deer-sized game out to 150 yd (140 m). For predator and varmint hunting, bullets weighing 90–125 gr (5.8–8.1 g) are commonly used.
The .308 Winchester is a smokeless powder rimless bottlenecked rifle cartridge widely used for hunting, target shooting, police, military, and personal protection applications globally. It is similar, but not identical, to the 7.62×51mm NATO cartridge.
The .308 Marlin Express was designed to produce performance similar to the .308 Winchester. This would give lever-action hunters improved performance over their .30-30 Winchester rounds. The table below shows how the rounds compare. Note that reloading data for 160-grain (10 g) bullets for some of the cartridges is not available.
The .300 Whisper (7.82×34mm) 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.