Having an empty cartridge with a bullet fitted is only a potential problem if it's a section 5 (designed to expand) bullet, traditional military ball (Full Metal Jacket) bullets are just lumps of lead coated in copper in the eyes of the law and can be held by anyone.
To the OP, I'll happily chuck in the lathe and drill a few of these for you if you want. I've got plenty of .243 here but would need any .308 sending down.