A young man who works for me recently went to a gun show and purchased a few rifles.
In discussing, I learned they were some non-common calibers. I expressed to him how only few shots would be needed for hunting, however, target shooting and becoming proficient would require some somewhat rare and expensive rounds, barring reloading which is not a cheap endeavor. I expressed my leaning toward common calibers unless an expert preference is developed for the 'Exotic' rounds. .243 is quite popular here.