RE: What could we do without?
Long guns:
.22lr
12ga
.223
30-06
458 Lott
Handguns:
40S&W
454 Cassull
But this sure would be a pretty boring place to live, shoot, and hunt if we had to minimize.
If you notice none of us have picked all of the same cartridges for our personal lists. Hence why we have somany choices.