The ballistics of the .260 Remington are basically similar to a cartridge developed in what year?
.260 Remington The .260 Remington (also known as 6.5-08 A-Square) cartridge was introduced by Remington in 1997. Many wildcat cartridges based on the .308 Winchester case had existed for years before Remington standardized this round. Although loaded to higher pressures, the ballistics of this cartridge are basically similar to the 6.5×55mm when bullet weights do not exceed 140 grains. When loaded with heavier bullets, the 6.5×55mm is capable of greater velocity. Due to its shorter overall length the .260 Remington can be chambered in a shorter length action than the 6.5×55mm.
6.5-300 Weatherby Magnum The 6.5-300 Weatherby Magnum is a 6.5mm cartridge created by Weatherby in 2016 as its own rendition to the ever-growing 6.5mm long range rifle market.