In addition to conventional shells the gun is capable of firing Type MP-152 rocket-assisted projectiles.

The carriage also have a castor wheel mounted on each trail to help the crew deploy the gun.

[4] The Type 66 can fire High-explosive (HE), Smoke, and Illuminating shells using a variable six-charge bag propellant system.

It can also fire the Type MP-152 rocket-assisted projectile (RAP) shell to provide extended range.

[6] While the Type 66 is somewhat obsolete compared to modern artillery, it is a simple and robust system capable of operating under severe conditions with minimal maintenance support, and when "employed competently and in mass, it can still deliver decisive firepower", according to the United States Army sources.