unfortunately 204 ammo is still rare, but I did find some 222 rem mag brass. There is one problem with it and that is the cases are nickle plated. My assumption is that they are no good for fire forming but I wanted to confirm that.
But saying that these are OK or I find some plain brass ones is fire forming possible with a handi. All of what I have read has been with bolt guns where the partially size the neck until they can squeeze it into the chamber then fire form .
Also what sort of load do you use to fire form.
Hopefully the ammo supply picks up by spring but I was really wanting to try the 204 on a coyote this year.
I'll likely be starting with the 32 grain a-max what sort of results have people been getting from the other sizes?