Current Rifle Cartridges
6mm Creedmoor
History of the 6mm Creedmoor Cartridge:  
Hornady  introduced the
6.5mm Creedmoor cartridge in 2008.  It was fundamentally based
on a shortened and necked-down .308 Winchester case to accept
6.5mm ( .264" caliber)
projectiles. This produces velocities over 3,000 feet per second with a 120 grain projectile
with energy of up to and over 2,500 foot pounds per inch of energy for the
6.5mm Creedmoor.
As you can guess, in late 2015 Hornady saw the popularity of the 6mm calibers growing and
decided to neck down the 6.5mm Creedmoor case to accept 6mm (.243" caliber) projectiles
and called it the
6mm Creedmoor, which produced velocities over 3,300 feet per second with
a 108 grain projectile. The
6mm Creedmoor is joining many other fast 6mm calibers
introduced in the last few years and some good older 6mm calibers like the .243 Winchester
and 6mm Remington.  
Comparisons Picture to left
Left: 6mm Creedmoor
Center: 6.6mm Creedmoor
Right: .308' Winchester
     or 7.62 NATO