No, a katana or any traditional sword is not capable of cutting a bullet in half. The speed, size, and hardness of a bullet make it extremely difficult, if not impossible, to intercept or cut with a sword blade.

Bullets fired from firearms travel at high velocities and are specifically designed to penetrate targets. They are made of materials such as lead, copper, or steel, which are significantly harder than the blade of a sword. Attempting to cut a bullet with a katana would be ineffective and dangerous.

The idea of cutting a bullet in half with a sword is often depicted in movies or fictional works for dramatic effect, but it does not align with the reality of physics and the limitations of sword blades.

When it comes to dealing with bullets or firearm threats, it is important to prioritize personal safety, seek cover, and follow appropriate self-defense protocols. This may involve taking shelter, utilizing available cover, or employing other modern self-defense methods designed for dealing with bullets.

Always prioritize safety and follow the laws and regulations of your jurisdiction when considering self-defense options.