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The .243 Winchester Super Short Magnum or .243 WSSM is a rifle cartridge introduced in 2003. It uses a .300 WSM ( Winchester Short Magnum ) case shortened and necked down to accept a .243in/6mm diameter bullet, and is a high velocity round based on ballistics design philosophies that are intended to produce a high level of efficiency. [ 2 ]
The rimmed .375 H&H Flanged Magnum for double-guns and the .375 H&H Belted Rimless Magnum with a headspacing belt for magazine-fed rifles were released simultaneously in 1912. .375 Ruger: 2007 US 1 [4] R [5] 9.5×65.5mm 2840 [4] 4835 [4] 3.405 90.5 [10] 0.375 [10] 0.430 [5] 65.5mm Developed in collaboration between Ruger and Hornady. [citation ...
It was a ground-breaking development with at first only two factory loads, combining a versatile and effective combination of 80-grain bullets optimized for high-velocity, long-range performance for varmint hunters (e.g., groundhogs, coyotes, prairie dogs) and 100-grain bullets suitable for game up to the size of deer and pronghorn antelope.
In December 1955, Guns Magazine writer, H. Jay Erfurth in an article titled Two Varmint-Big Game Rifles discussing the .244 Remington and .243 Winchester wrote "the Winchester bullet of 100 grains is the better one for deer and medium game than the 90-grain Remington pointed soft-point, though the differences seem mostly splitting hairs." He ...
There are basic advantages inherent to the Short Magnum concept. The idea is that the short, fat powder column gives a more uniform load density and ignition rate and therefore a more consistent burn. This in turn should translate into improved accuracy and potentially moderate recoil due to more efficient use of propellants. [citation needed]
A light, fast bullet gives a flat trajectory, making range estimation less vital for accurate shot placement. Velocities for modern varmint rounds are usually in excess of 3,000 ft/s (910 m/s) such as the .223 Remington and some like the .220 Swift can exceed 4,000 ft/s (1,200 m/s).
The 6mm BR Remington cartridge is a .308×1.5" Barnes cartridge necked down to accommodate .243 bullets. The .308×1.5" Barnes cartridge is based on the .308 Winchester case shortened to 1.5 inches (38 mm). It is one of the earlier cartridges to follow the short, fat design concept.
The .222 Remington was a popular target cartridge from its introduction until the mid-1970s and still enjoys a reputation for accuracy. It remains a popular vermin or "varmint" cartridge at short and medium ranges with preferred bullet weights of 40–55 grains and muzzle velocities from 3,000 to 3,500 ft/s (915–1,067 m/s).