Yep. Got a box of shells back at the LGS one day...25-06 put into a box of .30-06...
Only problem was the box was Remington, and the ammo was Federal.
In my usual tactful demeanor I told the custom I believe that remington could make that kind of mistake,if they were remington shells, but I DONT believe someone from Federal snuck into the remington ammo plant and filled that box up!