how things can go wrong, lets see, cats, dogs, ferrets, kids, friends, spouses etc. I have yet to be at a house of serious shooter who doesn't have live ammo, duds or buggered up reloads all over the house. Sitting in cups, trays or other things in places like the kitchen, garage, bedroom, bathroom and laundry room. Those rounds then end up on the floor, in hands, shoes or boots, socks, etc and then end up in rooms where they shouldn't, under shelves, furniture and boxes. Then when you are practicing reloads, IAs etc, and you've been doing it for hours, you pick one up not realizing it's a live round because it looks exactly the same as the ones you made, hell it even weighs the same, and in the gun it goes. Obviously different in color and weight are going to be a lot easier to tell apart from ones that have epoxied primers, or holes drilled in them. Buy hey, go nuts, save $20 and make you own.
For those worried about cost, visit sight sponsor DS Tactical, if you can't afford $1 a piece for dummy rounds, well that's your problem.