Yeah, taking a rifle chambered in a common cartridge never seems important--until it happens.
It's never happened to me, even on an international trip, but I have lost count of the people who've been on the same trip, or are hunting from the same camp, that it's happened to.
Have even seen it right here in Montana. Two buddies and I drove to eastern Montana to hunt, and in the process of consolidating our stuff in one vehicle, a small ammo bag got shoved under the front seat of another pickup while somebody was taking out something else. Luckily all it contained was .30-06 and 12-gauge, and it was easy to resupply in nearest small town. .280 and 16-gauge would probably have been a different story.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
