I also made my own. I made friends with a a guy at the field clays range , and asked him if he'd make up a dozen dummy shells for me and he was kind enough to do so (gave him a six pack in thanks). I used some pink shotgun empties I had (can't recall the brand), and he used shot and sand to match the factory weight. I then sealed each crimp end with hot glue to keep it securely closed, and wrote "dummy" in black permanent marker on each casing. The bright pink color is enough to ID them as inert, as I have no live ammo in that color, but writing on each is just an extra safety step.