When I grew up in the shooting/hunting world there were only a handful of popular calibers. There were a few varmint cartridges like the .22 Hornet, and the "king" 220 Swift (the 22/250 was a wildcat), the next cartridge for deer (and for the wife) was the .257 Roberts. Above that was the .270 Winchester which was good for anything up to and including elk, then the very popular 30/06 which was good for anything...except if you wanted to shoot brown bear you might want the 300 H&H Mag. The .375 H&H Mag was the go-to gun for Africa. That was about it. And, believe it or not, they all worked as advertised. But I used to read everything I could get my hands on and knew for an absolute certainty that if I ever could afford a .300 Weatherby Magnum I would REALLY be ready for anything. Finally I acquired one, began reloading and used it for jackrabbits, coyotes, deer, antelope, elk, moose, caribou and a black bear in Alaska. One caliber did everything. ThenI kept reading and realized that I had missed out on so many other "necessary" calibers so now I reload for about a dozen calibers. No, I haven't done anything more with more calibers, just have satisfied many itches along the way. So what? Simply that almost everything can work. I am now 85 so my shooting history goes back a long way.