If limited to three calibers, which ones would you pick?

[thmpr]

9mm - Glock 17
7.62x39 - Khyber Pass/Bin Laden special AK-47
5.56x45 - AR15 Special Purpose Rifle marksman set-up (Mk12 Mod0)

Fixed it for you..

[thmpr]

223/5.56
9mm
308

[Jason762]

Fixed it for you..

Thank you sir, and edited to reflect that.

[JDoe]

10mm
7.62 x 39
.338 Lapua Magnum

[PressCheck]

.308
12 gauge
.45 acp

Me too.

[rrr70]

.45 in Glock for close-ups
7.62 in AK for intermediate
.308 or .338 in bolt rifle for long shots

[John Browning]

For three calibers, I pick:

.22
.45
.30

Those three probably account for half the known cartridges on Earth. I'm sure glad this thread isn't about picking three cartridges...that would be hard!