Why are there so many gun models using the same calibre? Doesn’t the bullet determine most of the lethality and range, while the gun is just the vehicle that fires it?

Question

Why are there so many gun models using the same calibre? Doesn’t the bullet determine most of the lethality and range, while the gun is just the vehicle that fires it?

In: Physics

Answer 1

It’s like all guitars using the same string sizes. They all do the same thing, but theres a big difference between a $50 no name starter pack guitar and a $3000 dollar custom shop guitar from a major manufacturer. And to the experienced player theres preferences to take into account even in the same tiers of quality and budget. Same with guns.