For those that travel and hunt..........
I would assume 223, 308, 30-06, and 7.62x39 would be available at most any decent store in major countries.

Also how about the winmags, 300, 338, 458 winmags etc.

I would think the mauser rounds might be more available in Russia and Europe, like the 7mm, 8mm, 9.3mm

Say for

Alaska
Africa
Russia or mainland europe