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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]
In the 6.5×55mm Ackley Improved the cartridge case capacity is raised to approximately 4.03 ml (62.2 g H 2 O). The Ackley Improved family of wildcat cartridges is designed to be easily made by rechambering existing firearms, and fireforming the ammunition to decrease body taper and increase shoulder angle, resulting in a higher case capacity.