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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.
The .416 Remington Magnum was based on the company's then fairly new 8 mm Remington Magnum which was necked up to accept a .416 in (10.6 mm) bullet. The 8 mm Remington Magnum in turn was based on the .375 H&H Magnum which improved by blowing out to reducing the taper and increasing case capacity and then necking it down to accept a .323 in (8.2 ...
At the time of its introduction the .350 Remington had a short, fat case, similar to the current crop of short magnums except that the .350 carries a belt.Its closest competitor, the .35 Whelen was still just a wildcat from a necked-up .30-06, so the .350 Rem was the most powerful .35 caliber around, and in a short cartridge that allowed the use in compact quick-handling rifles. [3]
The .277 Wolverine (6.8x39mm) is a wildcat cartridge. It is a multi-purpose mid-power cartridge with increased ballistic performance over the AR-15 's traditional .223 Remington (5.56×45mm NATO) cartridge. The use of a modified 5.56 case means that at minimum, only a new barrel is needed to convert any 5.56-based firearm to .277 Wolverine.
The 8mm Remington Magnum is suitable for hunting almost any game animal on the planet, though certain sub-Saharan Africa countries have a 9.53 mm (.375 in) or 10.2 mm (.40 in) minimum caliber rule for hunting Big Five game – i.e. leopard, lion, Cape buffalo, rhinoceros and African elephant.
The 6 and 6.5 have relatively light recoil compared to high BC bullets of greater caliber and tend to be shot by the winner in matches where accuracy is key. Examples include the 6mm PPC, 6mm Norma BR, 6×47mm SM, 6.5×55mm Swedish Mauser, 6.5×47mm Lapua, 6.5 Creedmoor, 6.5 Grendel, .260 Remington, and the 6.5-284.
In 1925, Winchester introduced the .270 Winchester, previously known as the .270 WCF, based on the 30-06 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 ...
The 6×45mm cartridge provides better down range performance than the .223 Remington or the 5.56 NATO cartridges. The cartridge is currently offered by Les Baer in an AR rifle. The cartridge had been offered by Cooper Arms, Kimber and a few other rifle manufacturers in their rifles as a regular factory chambering for a period of time.