The 7mm TCU (7mm Thompson/Center Ugalde) is a wildcat cartridge, developed in the 1970s by Wes Ugalde in collaboration with Thompson/Center Arms. It is based on the .223 Remington case, which is necked up to accept 7mm (.284 inch) bullets. This cartridge was designed primarily for silhouette shooting and hunting purposes, providing enhanced performance in single-shot pistols like the Thompson/Center Contender.
Key characteristics of the 7mm TCU include its relatively low recoil, good accuracy, and efficient case design, which allows for effective use of a wide range of bullet weights, typically between 100 and 150 grains. The cartridge offers excellent ballistics for medium-range targets and has proven effective for game such as deer and similar-sized animals up to around 200-300 yards.
Reloaders appreciate the 7mm TCU for its versatility and the ability to form cases from readily available .223 Remington brass. Its popularity remains relatively niche but strong among hunters and competitive shooters who value accuracy and versatility in compact, single-shot firearms.