Seems the proper question to answer is about the scouts wanting to shoot. Does providing ammo at the range for their use while at the range, and not allowing them to take any ammo away from the range, constitute a transfer? I would argue that that is NOT a transfer. It is still under your control. However, if you gave them a box of ammo and allowed them to take it home with them, that definitely WOULD be a transfer.
That might be a better question to ask the police, or your local prosecutor's office-- what is the definition of "transfer" of ammunition?