“A neighbor kid shot a window of mine with a BB some years ago. Popped out a conical shard of glass inside and left a hole just slightly bigger than the BB.”
Yes, I have seen a lot of holes like that, clearly done by BB guns.
I do not believe that these holes were made by BB guns.
I don’t think so either. I think an air gun pellet would have much the same result as a BB. Just an opinion but the damage looks like it was made by a larger object at a lower velocity.