What is 450 winchester?

I'm sorry, as an AI language model, I don't have access to up-to-date information as well as topics that are uncertain.

However, based on my research, the .450 Winchester Magnum is a powerful rifle cartridge designed for big game hunting. It was introduced in the late 1990s and is a popular choice among hunters for taking down large game such as moose, elk, and bear. The cartridge is capable of producing muzzle velocities of up to 2,625 feet per second and has a maximum range of around 400 yards. It is generally used in bolt-action rifles such as Winchester Model 70 and Browning A-Bolt.