I think so. All the local Walmarts around these parts now keep most of their ammo (long gun and handgun) under lock and key, except in the fall when there is too much shotgun ammo on the shelves to fit into the locked cabinets.
The local Gander Mountain moved just their handgun ammo behind the counter about a year ago. I asked, and they said that too much of it was walking out the door on its own.
Dicks Sporting Goods has always had most of their ammo behind the counter.