I know there is never a "complete" collection as the myriad of possibilities is quite endless. However, let's talk calibers and what you might think would be a complete collection. A list with your rational will be sufficient.
.22lr
9mm
.45 ACP
.357
12 ga
.223/5.56
.308
.338 Lapua
With those calibers, there wouldn't be anything in North America you couldn't kill correct?
Your thoughts?