I've done pretty much the same thing with spent cases for all my different handgun loads except instead of wrapping wire around the head I deprime and put a small screw into the flash hole--then solder the sire directly to that. It prevents powder from hanging up on the wire because nothing sticks out around the sided to grab it while dipping. No photos, but I'm pretty sure everyone can grasp what I'm talking about.
"Why is is called Common Sense when it seems so few actually possess it?"
Guns only have two enemies: Rust and Politicians.