Is a 223 bore the same width as a 22 bore?

No, a .223 bore and a .22 bore are not the same width. The .223 Remington cartridge has a bullet diameter of approximately 0.224 inches, while the .22 caliber typically refers to a bullet diameter of 0.223 inches. While they are very close in size, the .223 is slightly larger than the traditional .22 caliber bullets, which include .22 Long Rifle and others.