Similar to Larryh1108, I went in to Cabelas several years ago (before I had started reloading) to see if they had any PPU 7x57. I couldn't find any so I went to the service desk to see if they had any in stock. They listed 4 boxes in stock and told me to go to the service desk between guns and camping stuff and they should be able to find it for me.
I asked the guy there if he could help me find the 7mm Mauser since it listed it as being in stock, but it wasn't on the shelf. He "corrected" me and told me that I should have asked for 7mm Magnum. I told him, again, that I knew what I was looking for and it would be listed under 7mm Mauser and that the front service desk had looked it up for me already. He said that they don't know anything about guns and he would be saving me grief. "'Mauser' is Spanish for 'Magnum'" is what he told me.
I told him that Peter Paul Mauser was the name of the German firearm designer and it was very different from any of the 7mm magnums. He then asked for the gun department manager to come "educate" me because I was going to blow myself up. When the manager showed up and he got the story from the man at the counter, I was upset because I didn't have video running. The manager covered his face with one of his hands and called the guy an "idiot" in front of me and several other customers. The manager got on the computer and pulled up the ammunition I was looking for. He told me that the he'd have someone find it and bring it out to me but to wait by the gun counter for it. The original "helper" was walked through one of the employee-only doors at the back and I haven't seen him again on any of my subsequent visits.
The manager met me at the gun desk about 20 minutes later and gave me the 2 boxes I was looking for and apologized profusely.
Matt