The .375 Cheyenne Tactical, or .375 CheyTac for short, is a sporting rifle cartridge.
Introduced in 2009, the .375 CheyTac originally started out as a wildcat based on the .408 CheyTac. It became officially certified by the C.I.P. in 2017 under the 375 Chey Tac designation. At some point in October 2020, CIP removed both the 375 and 408 CT drawings from their website. This follows unsupported claims of weapon system malfunction. Peterson, as the claimed world’s-largest supplier of brass for these chamberings, was blindsided by the CIP drawing removals and has, in response, produced and posted Peterson (effective) re-draws of the official, previously-CIP-posted drawings.
This cartridge is essentially the .408 Chey Tac necked down to use a smaller .375 caliber bullet. Built on the same premise as its parent, which is of a very high speed lightweight projectile to reduce recoil, ideal for long-distance precision shooting.
According to Cheyenne Tactical, the .375 Chey Tac has a slightly higher ballistic coefficient than the .408 Chey Tac. Even though it was developed as a civil cartridge, Australian sniper teams were said to have used the .375 CheyTac to engage targets in excess of 3,000 yards (2,743.2 meters).