Six millimetres is equivalent to 0.236 inches. To convert millimetres to inches, divide millimetres by the amount of millimetres in an inch, which is 25.4. Six millimetres is close to a quarter inch, falling short by approximately.014 inches.
Several types of ammunition are reported as having a calibre of 6 millimetres. A calibre measures the internal diameter of a firearm barrel as well as the bullet’s diameter as it goes down the barrel. Despite the fact that several types of ammunition are labelled as being 6 millimetres in diameter, the bullet diameter of these rounds is typically 6.17 millimetres or greater.