when I was in college I interviewed for a job as an armored car guard. They told me I was required to use a 4" 38 special revolver, which they said was for insurance reasons. At the time all I had was a 6" 357 mag, which I asked if would be acceptable if I loaded 38's. They were adament that it had to be an actual 4" 38, because they looked less menacing apparently, and obviously it was still POSSIBLE to put 357's in a 357, so the accusation could be that's what I had, and they wanted to be able to be certain it was only 38's. I don't recall there being an ammo restriction (non hp's or whatever) but maybe we just never got that far. I ended up turning the job down because it didn't pay THAT well that I wanted to lose the first two weeks pay right off the top buying a new handgun for it, when I could make the same money at any other mall type job and NOT have to lay out a couple hundred bucks up front.