Yep. A .416 Remington Mag will kill Godzilla or anything that every lived!
When the Mora first arrived in New Zealand there were bigger birds than that living there. NOW extinct.
I am partial to the 416 Rigby myself. Which the Remy was created to duplicate in a standard mauser length action. There is something sexy about the Rigby’s huge fat case and thumb sized bullets. With woodleigh solids I have never recovered one in the bush. I took a cape buff with one in a North bound shot on a South bound buffalo complete penetration from stern to stem that’s over 7 feet of angry animal. In broadsides they leave fist sized exit holes every time. Unlike the movies flesh and bone regardless of the animal is softer than steel and copper and lead. I have zero doubt that a 416 Rigby would go completely through a T Rex sized animal. The 50bmg would be vast overkill with two times the energy of a 416. Humans are the apex predator who has ever lived on this planet we can kill any other animal that lives or lived. Blue whales are the largest animal to ever live dwarfing dinosaurs and humans nearly hunted them to extinction with sailboats before the industrial age and modern killing machines.