The .30 TC is a cartridge developed by Thompson Center Arms. It was released for sale in 2007. It was initially offered in the Icon series of bolt-action rifles, which were released at the same time. It was an attempt by Thompson Center to make a 308 Winchester length round with 30-06 Springfield performance. While it did accomplish this goal, consumer acceptance was low, and the round has remained on the sidelines.
References
.30 TC Wikipedia(Text) CC BY-SA