The cartridges were loaded from the front of the cylinder, with access to the primer from the rear, thereby skirting the White patent. Looking at the cylinder, one could argue that it is actually bored all the way through. Technically, this is correct; there is a hole all the way through the cylinder. However, the rear diameter is narrower than the front, preventing cartridges from being inserted any way but from the front. So, also technically, it isn’t bored all the way through because it cannot be loaded from the rear of the cylinder.