Can you put pellets in a BB gun?

Answer 1

While many pellet guns are configured to be able to fire regular BB's, most BB guns cannot fire standard BB caliber pellets. To fire a pellet, the BB gun would have to be a breech loaded or break-barrel loaded design, and the pellets would have to be loaded single-shot.

Answer 2

Not if it's not designed to shoot BB's. There are a few bb/Pellet gun combination air guns, but the instructions will tell you if it is alright to use both. But if it's a pellet gun or rifle designed for pellets only, then it is not recommended. The BB's are hard and will destroy the rifling in the barrel making the gun less accurate. It's a fullish move to make the gun do something it is not designed to do.