The 6mm Creedmoor is a centerfire rifle cartridge based on the 6.5 Creedmoor case necked down to 6mm (.243 caliber). Designed for long-range precision with very low recoil, it became popular in competition before establishing itself as a flat-shooting target and hunting round.

The 6mm Creedmoor grew directly out of the long-range competition world. It began when a shooter and ammunition maker necked the 6.5 Creedmoor case down to 6mm in search of higher velocity and lower recoil for precision matches, and the results were strong enough that it was adopted as a standardized factory cartridge. Its origin story is essentially "the 6.5 Creedmoor, optimized further for recoil-sensitive precision shooting." Ballistically the 6mm Creedmoor drives aerodynamic 6mm bullets — commonly 103 to 109 grains — at high velocity, producing a flat trajectory and excellent wind resistance with notably lower recoil than the 6.5 Creedmoor. That low recoil is the heart of its appeal in competition, where a shooter who isn't disturbed by recoil can spot their own shots and stay precise through a long string of fire. The same traits make it a capable varmint, predator, and deer-class hunting cartridge, flat-shooting and easy on the shoulder. The tradeoff familiar to fast 6mm cartridges is accelerated barrel wear from driving light bullets at high velocity, a cost precision and varmint shooters generally accept. As a cartridge closely tied to the popular Creedmoor family, its rifle and ammunition support has grown steadily. Today the 6mm Creedmoor is used for long-range target shooting and competition, varmint and predator hunting, and deer-class big game, with a solid and growing base of rifles and ammunition. Its blend of flat trajectory, excellent ballistic efficiency, and very low recoil is why it became a favored precision and dual-purpose cartridge.

General information about this caliber — not a recommendation for this specific firearm.