I place bouncers at the back ov the pattern so they look like they coming in to land, if you google pigeon patterns theres plenty of info and pictures on ther to look at,
Try your local pet shop for a small kitten coller and cut it down a bit, that should be ok for you to start the ferret getting used to having the coller on,
Getting about a bit en mate, ain't used my gun for a wile not a lot of birds about on my farms at the moment, I need to get out and find some new permission.