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The 6.5-284 has been used extensively in benchrest competitions and is known as an extremely accurate long range round. Using an improved version of the 6.5-284, Rich DeSimone set a 1,000-yard (914.4 m) world record with a 1.564-inch (39.73 mm) group. [4]
Components of a modern bottleneck rifle cartridge. Top-to-bottom: Copper-jacketed bullet, smokeless powder granules, rimless brass case, Boxer primer.. Handloading, or reloading, is the practice of making firearm cartridges by manually assembling the individual components (metallic/polymer case, primer, propellant and projectile), rather than purchasing mass-assembled, factory-loaded ...
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 new "super short" case was to be based on design principles currently proving successful in benchrest competition, such as the 6 mm PPC and 6 mm BR Remington. In 2003 the first cartridges of this design, the .223 and .243 Winchester Super Short Magnums (WSSM), were introduced.
The 7mm BR Remington / 7.2x38mm, commonly called the 7mm BR or the 7mm Benchrest Remington in long form, was an intermediate cartridge developed by Remington for the Remington XP-100 single-shot bolt-action handgun.
Trimming is a normal reloading operation, as high-pressure cartridges will flow each time they are fired, and periodically need trimming to remove the brass that flows to the mouth. Changing the diameter of the case (to suit a new caliber). Called "necking up" or "necking down", this is the most common way of making a wildcat.
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.950 JDJ cases are approximately 70 mm in length, and are based on a 20×102mm Vulcan case shortened and necked up to accept the .950 in (24.1 mm) bullet. Projectiles are custom-made and most commonly weigh 3,600 grains (230 g) which is 8.2 ounces or over half a pound.