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I used to work in the Sporting Goods section at Wal-Mart, and they never had any sort of policy like that. You could always have a manager paged to get stuff from behind the counter. They didn't sell guns after about 11 pm, but everything else was available. Of course, you'd usually have to wait half an hour or so for the manager to wake up from their evening nap.
They also never kept 22 ammo locked up. We would have the big bricks of it setting out on the counter, since it was such a good seller. The only thing they kept locked away was handgun ammo.