Walk a rifle ammunition shelf today and the small bores dominate: 6mm and 6.5 millimeter cartridges that a generation ago were mostly curiosities. They share a simple idea. Long, slender bullets of moderate weight hold their speed and fight the wind well, while recoil stays gentle enough to shoot all day.

The 6.5s: one bore, many cases

The 6.5 Creedmoor started the stampede. Hornady introduced it in 2007 with Creedmoor Sports as a target cartridge, and shoppers who want it usually start at 6.5 creedmoor ammunition.

Hornady followed in 2018 with the 6.5 PRC, a short-action magnum alternative, and its polymer-tip loads are grouped at 6.5 prc polymer tip ammo.

The 6.5 Grendel carries the same bullet diameter into the AR-15. Alexander Arms introduced it in 2003, and 123-grain loads such as those at 6.5 grendel 123 grain ammo are a typical weight.

Weatherby's 6.5 RPM, from the late 2010s, uses a beltless case with a rebated rim to give magnum-class speed without Weatherby's traditional belt, and the hunting loads at 6.5 weatherby rpm hunting ammo reflect the job it was built for.

Older relatives still turn up. The 6.5-284 Norma is a .284 Winchester case necked to 6.5 millimeters and grew up among 1,000-yard benchrest shooters, and 6.5-284 norma ammo for sale is where its loads are listed. The 6.5x54 Mannlicher dates to 1900 and the Mannlicher-Schonauer rifle, which makes it a century older than the cartridges above, and 6.5x54 mannlicher ammo for sale covers it.

The 6mms

The 6mm Remington began as the .244 Remington in 1955 and took its present name in 1963. Its soft-point loads, at 6mm remington soft point ammo, remain the traditional deer-and-varmint choice.

Hornady's 6mm Creedmoor of 2017 is the 6.5 Creedmoor case necked down, and its 105-grain loads are at 6mm creedmoor 105 grain ammo. The 6mm ARC, which Hornady introduced in 2020, does a similar job in a cartridge sized for AR-15 actions, and it has its own page at 6mm arc ammo.

The odd one out

To see how wide the field is, look at the other end. The 9.3x74R is a rimmed European round from 1900, built for break-action rifles and drillings and loaded with heavy bullets around 286 grains. The Federal loads for it are at federal 9.3x74r ammo.

Cartridge families overlap, so match the name on your barrel exactly. Confirm current stock and any state shipping restrictions before ordering