I had occasion to admosnish one of the 7 em em folks way back.
He came in said he wanted some 7 em em shells, I put a box of 7x57 on the counter, he said quite perturbed "no magnums", so I put a box of 7mm WTBY's on the counter, he looked blankly at me and said I thought there was only one type of 7 em em out there, I sucintly explained that there (at the time) was no less than 6 factory loaded 7 em em's out there (7mm-08, 7 mm Rem Exp, 7x57, 7x64, 7mm Rem Mag, 7mm Wtby mag) (2 years later the STW made the scene)
He looked like a deer in the head lights.
I simply stated I was not a mind reader, and he should ask for what he needed by it's proper name.
FWIW; it's no different than guys asking for 180gr. 270 wins, and 180 gr 7 Rem Mags, these sorts of folks do not know too much about firearms, and ammunition.
Come to think of it are they any more denser than the local cops or media?