What cartridges are you able to shoot?
It's a pretty simple question. It's not what firearms you have, or how many, etc. SImply, if every type of ammunition ever made landed in your front lawn this instant, which if it would you be capable of firing, given the firearms you own?
For me...
5.56x45mm NATO/ .223 Remington
7.92x57mm Mauser
9x19mm Parabellum
12 Gauge
.45ACP
7.62x39mm
What about everyone else?
How foolish of me, .22LR, of course.