6.5 Creedmoor – Hornady Cases 500 rounds

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The 6.5mm Creedmoor (6.5×48 mm),^[6] designated 6.5 Creedmoor by SAAMI, 6.5 Creedmoor by the C.I.P. or 6.5 CM or 6.5 CRDMR for short, is a centerfire rifle cartridge introduced by Hornady in 2007.^[7] It was developed by Hornady senior ballistics scientist Dave Emary in partnership with Dennis DeMille, the vice-president of product development at Creedmoor Sports, hence the name. The cartridge is a necked-down modification of the .30 Thompson Center.^[8][9]

The 6.5mm Creedmoor was designed specifically for long-range target shooting,^[7] although it has been used successfully in game hunting.^[8] Bullet-for-bullet, the 6.5mm Creedmoor achieves a slower muzzle velocity than longer cartridges such as the 6.5-284 Norma or magnum cartridges such as the 6.5mm Remington Magnum. However, due to its overall length of 2.825 inches (71.8 mm), it is capable of chambering in short-action rifles like the 6.5×47mm Lapua.

Design considerations[edit]

In general, 6.5 mm (.264 in) bullets are known for their high sectional density^[8] and ballistic coefficients, and often have been used successfully in rifle competitions. The 6.5mm Creedmoor was designed for target shooting at longer ranges, and as such, couples a sensible case volume (3.40 ml) to bore area (34.66 mm²/0.3466 cm²) ratio with ample space for loading long slender projectiles providing good aerodynamic efficiency and external ballistic performance for the projectile diameter.^[4] For some loads, the 6.5mm Creedmoor is capable of duplicating the muzzle velocity^[2] or trajectory^[10] of the .300 Winchester Magnum while generating significantly-lower recoil, based on lighter projectile weight.