.7mm TCU came from the house of famous arms and ammunition manufacturer Thomson Center. The cartridge was made for the Thomson Center Contender line of pistols. Wes Ugalde is credited with making it for Thomson Center. He made it around 1980 for usage in single shot Contender pistols. He modeled .7mm TCU on lines of neck-up .223 Remington modifying the shoulder. He also managed to keep the pistol recoil at acceptable levels.
The .7mm TCU is popular among pistol owners for its accuracy in shooting targets. The .7mm TCU is not meant for medium or big animal games. It is used to shoot down small size targets like antelopes or small deer. If it is shot from a long barrel, chances are that it can be used for medium sized targets like a Deer or Wild Boar.
.7mm TCU is a short range cartridge. .7mm TCU requires a barrel of at least 10 inches to reach its full potential. Remington 223 brass can be used to make case. It is simple to make a case for .7mm TCU. The case should have a 40 degree angle at shoulder and the neck should be .284 inch wide. Due to this when loading a bullet, the shoulders tend to bulge or collapse. Hence extra care should be taken while loading the .7mm TCU.
.7mm is usually fired from a 14 inch barrel. The bullet which can be used with it should be in the range of 100 grain to 150 grain. The optimum bullet speed for the lighter bullets is approximately 2100 feet per second. The bullet velocity drops by 200 fps for a 50 per cent increase in bullet weight. Various pistol experts suggest different powders to go with it. The most common powder names are IMR4198, H4895, BLC2.
.7mm TCU has been fairly successful cartridge and has stood up in competition.
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