Victor,
I read a book titled "The Saga of Indian Cannons" by R. Balasubramaniam, and parts of another that I think was titled 'The Evolution of Indian Artillery' (can't recall authors name).
It's thought that the highly ornate cannons (like the Sikh guns that I've posted in the past ) were not only meant to be used, but may have been the artillery issued to the ruler's elite forces.
To me these are in the same vein as the early European bronze cannons that could double as artistic sculpture. The artillery not only served as weapons, but as representations of a ruler's power, status, and pride.