List of AR platform cartridges

Because of the pressures associated with the 5.56×45mm, it is not advisable to fire 5.56×45mm rounds in an AR-15 marked as .223 Remington, since this can result in damage to the rifle or injury to the shooter.

Examples include (sorted by overall cartridge length): A variety of manufacturers have introduced semiautomatic shotguns whose overall designs are heavily influenced by the AR pattern rifle.

Other cartridges were derived from re-forming an existing case and possibly trimming the length in order to arrive at a case-shape that meets the standardized SAAMI-spec dimensions.

22 Nosler : Proprietary, uses the head and rim dimensions of the 5.56x45, and a case-body that is similar to the 6.8 SPC case.

224 Valkyrie : Uses 6.8 SPC cases, trimmed shorter, and the shoulder re-formed at a lower location due to being designed for using relatively long "high BC" (Ballistic Coefficient) bullets.

277 Wolverine : Standard military 5.56x45 case (also .223), shoulder is reformed lower, length is trimmed, neck is sized to .277 6.8 SPC (.277) : Proprietary.

The head and rim dimensions exactly match the military 5.56x45 case, allowing the use of the standard bolt-face of an AR-15.

This means that you can use existing 357-Sig dies to re-form the straight-wall 10mm case into a shouldered .355" (9mm), and then the neck can be sized up to accept .358 rifle bullets.

Bullet weights are currently available between 225gr-310gr 358 Yeti :Uses standard military 7.62x51 cases (also .308), length is trimmed, shoulder is reformed, neck is sized to .358".

Bullet weights are currently available between 225gr-310gr 375 Stalker : Standard military 7.62x51 cases (also .308), length is trimmed, shoulder is reformed, neck is expanded to .375 375 SOCOM : Proprietary.

The case is necked out and trimmed off above the shoulder at a case-length of 1.700", with a COAL of 2.250", resulting in a "straight-wall" cartridge.

The 450B is limited to 35,000-psi, which is more common in pistols, and lower than similarly sized rifle cartridges.

(7.62x51 & .308 are similar in external dimensions though the Brass has different internal capacity and Max PSI recommendations are different & Chambers are different.)

This means that the stronger AR-10 receiver and bolt carrier group is needed for shooting this cartridge.