Winchester introduced the 375 in the Fall of 1978 as a 1979 model. It generated a lot of positive press at the time. Some writers even suggested that the 30-30 was finally doomed to obscurity by this cartridge. The case dimensions are similar to the much older 38-55 but the 375 has a slightly shorter case and loaded to much higher pressure. This cartridge is no magnum but produces quick kills along the same approximate level as 35 Remington. In short, the 375 is certainly adequate for the modern forest and foothills hunter.
For some reason, this middle bore never reached the popularity forecast by writers of the time. But middle bores never have been widely embraced by North American hunters.
Jack