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2. 8.6mm Blackout - Wikipedia

   en.wikipedia.org/wiki/8.6mm_Blackout

   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.

3. 6.8mm Remington SPC - Wikipedia

   en.wikipedia.org/wiki/6.8mm_Remington_SPC

   The 6.8mm Remington Special Purpose Cartridge (6.8 SPC, 6.8 SPC II or 6.8×43mm) is a rimless bottlenecked intermediate rifle cartridge that was developed by Remington Arms in collaboration with members of the U.S. Army Marksmanship Unit and United States Special Operations Command [6] to possibly replace the 5.56 NATO cartridge in short barreled rifles (SBR) and carbines.

4. 8 mm caliber - Wikipedia

   en.wikipedia.org/wiki/8_mm_caliber

   Name Bullet Case type Length Rim Base Shoulder Neck OAL .32 ACP (.32 Auto): 7.94 (.3125) 17.3 (.68) 9.1 (.358) 8.6 (.337)-8.55 (.3365) 25.0 (.984).30 Super Carry: 8.0 ...

5. 6.8 Western - Wikipedia

   en.wikipedia.org/wiki/6.8_Western

   In 1925, Winchester introduced the .270 Winchester, previously known as the .270 WCF, based on the 30-03 Springfield case necked down to .277" (6.8 mm). Although the .270 Winchester was not an instant success, within a few decades it became one of the most popular big game hunting cartridges for mid sized game worldwide, because of its relatively mild recoil and flat trajectory within ...

6. .300 AAC Blackout - Wikipedia

   en.wikipedia.org/wiki/.300_AAC_Blackout

   The .300 AAC Blackout (designated as the 300 BLK by the SAAMI [1] and 300 AAC Blackout by the C.I.P. [2]), also known as 7.62×35 mm, is an intermediate cartridge developed in the United States by Advanced Armament Corporation (AAC) for use in the M4 carbine.

7. .277 Wolverine - Wikipedia

   en.wikipedia.org/wiki/.277_Wolverine

   Like the .300 AAC Blackout and unlike the 6.8 SPC and other "larger bore" AR-15 cartridges, the .277 Wolverine is based on the widely available 5.56×45mm parent case. Therefore, rifle components such as the bolt and magazine are interchangeable between 5.56×45mm and .277 Wolverine firearms, and standard AR-15 magazines can be used with no ...