When I was a kid I hunted with a hand-me-down Remington 742, the only times it ever loaded a second round is when I didn't need it. Does that qualify?

I have killed deer with .50 cal muzzleloaders, Sharps .45-70 , High Wall .45-70 and the 9.3x72mm barrel of a drilling. There have been a couple of occasions that I would have shot again, that turned out to have been unnecessary.