I personally would stay away from "odd" rounds if it was my only handgun.
Lets just say **** gets REALLY bad ( we r not far from it) you will ALWAYS be able to find NATO rounds, that will not be the case with rnds like .40, 10mm, 357sig, 45gap.
many guns in my safe but my preferred cary is my;
"BL" gen4 G17
"A well regulated millitia and a persons right to keep and bear arms shall not be infringed upon"