6.5mm Creedmoor

In general, 6.5 mm (.264 in) bullets are known for their high sectional density[7] 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 ratio of case volume (3.40 ml) to bore area (34.66 mm2/0.3466 cm2) 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[9] of the .300 Winchester Magnum while generating significantly-lower recoil, based on lighter projectile weight.

(Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) rulings, 6.5mm Creedmoor can handle up to 435.00 MPa (63,091 psi) Pmax piezo pressure.

In CIP-regulated areas, 6.5mm Creedmoor chambered arms are proof-tested at 543.80 MPa (78,872 psi) PE piezo pressure.

According to Gunners' Review, this ammunition is often regarded as a secret weapon for precision shooters due to its impressive ballistic properties.

[19] A semiautomatic sniper rifle with a 20-inch barrel chambered in 6.5mm Creedmoor is capable of engaging military targets from point blank range to 1,200 meters.

[27] Lapua delivered 6.5mm Creedmoor brass at Shot show 2017,[28] and production quantities became available via major retailers in second quarter 2017.

SOCOM determined 6.5 Creedmoor performed the best, doubling hit-probability at 1,000 m (1,094 yd), increasing effective range by nearly half, reducing wind drift by a third, with less recoil than 7.62×51mm NATO rounds.

[41] At the National Defense Industry Association's annual Special Operations Forces Industry Conference (SOFIC), beginning May 20, 2019, FN unveiled a prototype of its Mk 48 Mod 2 machine gun chambered in 6.5 mm Creedmoor to fill a USSOCOM requirement.

American special operations forces are in the process of acquiring a lightweight belt-fed machine gun offering a better range than existing weapons.

[43] In November 2019, the U.S. Navy ordered 6.5 mm Creedmoor conversion kits to upgrade the M110 Semi-Automatic Sniper System to the M110K1 variant.

[45] In August 2023, Geissele Automatics announced its design had been selected for USSOCOM's Mid-Range Gas Gun Sniper (MRGG-S) program.

The objective statement called for a rifle chambered in 6.5 mm Creedmoor with accuracy of 0.5-1.0 MOA at 100 yd (91 m) and weighing less than 10.5 lb (4.8 kg).

The longest 140gr bullets reach the neck-shoulder junction. Due to the relatively long neck, it can be reloaded with long target bullets without placing the base of the bullet below the neck. This eliminates the "donut" problem seen by many cases after being reloaded over 20 times. Left to right: a Remington 140gr and a 123gr A-Max. Calipers are set to magazine length.
From left: 6mm Creedmoor, 6.5mm Creedmoor, .308 Winchester