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Nigeria
Practice Relating to Rule 77. Expanding Bullets
Nigeria’s Manual on the Laws of War states: “It is expressly forbidden to use … irregularly shaped bullets … The scoring of the surface of bullets and filing off of the end of their hard case … are also prohibited.” 
Nigeria, The Laws of War, by Lt. Col. L. Ode PSC, Nigerian Army, Lagos, undated, § 11.
The manual includes “using expanding bullets” in its list of war crimes. 
Nigeria, The Laws of War, by Lt. Col. L. Ode PSC, Nigerian Army, Lagos, undated, § 6(7).