| Centerfire rifle|
| United States|
The 6.5mm Creedmoor is a centerfire rifle cartridge introduced by Hornady in 2007 as a modification of the .30 TC, which was based on the 300 Savage. It was designed specifically for rifle target shooting, although it is also achieving success in hunting. Bullet for bullet it achieves a slower muzzle velocity than longer cartridges such as the 6.5-284 Norma or magnums such as the 6.5mm Remington Magnum. However, due to its 2.825 inch overall length, the 6.5mm Creedmoor is capable of being chambered in short-action bolt rifles and AR-10 rifles.
6.5mm Creedmoor Wikipedia
6.5 mm (.264") bullets, in general, are known for their relatively high sectional density and ballistic coefficients, and have seen success in rifle competition. For some loads the 6.5mm Creedmoor is capable of duplicating the muzzle velocity or trajectory of the .300 Winchester Magnum while generating significantly lower recoil, based on lighter projectile weight. As this cartridge is designed for a bolt face diameter of .473 inches (roughly 12 mm), conversion of a short action rifle to another caliber (such as the .22-250 Remington, .243 Winchester or .300 Savage) with similar bolt face diameter generally requires little more than a simple barrel change.
This is a medium power cartridge often compared to the .260 Remington and 6.5×47mm Lapua but is not as accurate as the Lapua case. Three hundred yard energy using 129 grain Hornady SST bullets is listed by an independent reviewer as 1641 ft. lbs. For the 140 grain bullet at 2700 feet per second initial velocity another reviewer reports an MPBR for a six inch high target of 265 yards and reports a manufacturer claim of "almost 1600 ft. lbs." of retained energy at 300 yards using a 24-inch barrel. SAAMI test data confirms 6.5 mm Creedmoor (fifteen feet from muzzle) velocity of 2,940 fps for the 129 grain bullet and 2,690 for the 140 grain bullet (which compares to .300 Winchester magnum data of 2,930 fps for a 200 grain bullet and 2,665 fps for a 210 grain bullet). Long-range shooter Ray "RayDog" Sanchez summarised the bolt-action Tubb 2000 rifle in 6.5mm Creedmoor as "boringly accurate" at 1000 yards (914.4 metres). He asserted the rifle and ammunition combination he used was able to maintain sub-MOA groups at 1000 yards (914.4 metres). The 6.5 Creedmoors accuracy compared to the 6.5x47 Lapua, a cartridge that has nearly identical ballistic performance, falls just a little short for hand loaders. According to Rifleshooter.com’s editor, "In my personal experience, the 6.5×47 Lapua seems to be slightly more accurate than the 6.5 Creedmoor."
Handloading for the 6.5 Creedmoor is expensive(compared to the 6.5×47Lapua). Brass often costs $0.068 per reload because it lasts less than 10 reloads on average. Norma now makes brass for the cartridge but it is hard to find and expensive. 6.5×47 lasts about 20-35 reloads. When the 6.5 CM was first introduced it was advertised as a 60,000 psi capable case. However, when it was placed into production Hornady listed it as 62,000 psi and had it SAAMI registered as such. For this reason many hand loaders have had poor experiences reloading for it. Blown primers on the first shot at 62,000 psi is not uncommon. Early shooting articles listed the ammo as loaded to 58,000 psi but later ones list it as 57,000 psi. This is because Hornady reduced the loads in its factory ammo because of complaints that it was often blowing primers. Lapua brass though is on the way. Lapua has delivered Creedmoor brass at Shot show 2017, and production quantitates are starting to show. The Lapua version has a small primer pocket. Thus, loads from a Lapua Creedmoor should not be used in a regular Creedmoor with a large primer pocket without applying proper hand loading test for pressure first. Also the use of a smaller diameter decapping rod is required to size and decap.