What is the worlds most powerful rifle?

Answer:
As far as an individual weapon goes (vs. a crew served one), it would be the South African Denel NTW-20x110 and Croatian RT-20, both of which fire a 20x110mm cannon cartridge of the sort originally designed for the Hispano-Suiza antiaircraft cannons.
First answer by BurningSaviour. Last edit by BurningSaviour. Contributor trust: 231 [recommend contributor recommended]. Question popularity: 2 [recommend question].