I never de-bulged .40 S&W with live rounds or primed brass. I de-bulged .40 brass before it was primed. My home made pusher worked fine. It was an empty piece of 357 mag brass filled with epoxy and it did push the brass all the way through the die. from there it collected in an empty water bottle set over the top of the LEE die. I use the same bottle with my redding die.
2. Tumble and clean.
Begin normal reloading process.
I load, 9mm Luger, 38 and 40 S&W, 38 Special, 357, 45ACP, 45 Colt, 223, 243 and 30-06