Years ago, while in grad school, I worked in a Woolco sporting goods department. One of my fellow workers sold a guy a Marlin 336 in .35 Remington and a box of .30-30 ammo, because everyone knows that Marlin 336s were only made in .30-30. Needless to say, right after the customer's first visit to the range, he was back and sputtering and foaming at the mouth angry. We accepted return of the rifle, the fired case (which had expanded and ruptured as expected) and the remaining 19 rounds of ammo and refunded his money. Then my boss put the rifle back on the shelf, sold the partial box of ammo at a reduced price and told my knuckleheaded co-worker what a moron he was and how to identify the cartridge for which the rifle was chambered. Shortly afterward, I graduated and that was the end of that. Not too long after, Woolco went into bankruptcy and disappeared.