I picked up a CZ 527 kelvar stocked 204 in Oct. Its very accurate with 32 Sierra blitz Kings. I have only called in 1 red fox and got him at about 20 Yds, It blew a big hole on the off side. My favorite calling gun is a 527 American in 221 firball all coyotes and fox taken with it have had no fur damage, you need to use the right bullets. any of the ballistic tip bullets seem to blow up to easy, The 50 Sierra Spirepoints seem to penatrate better. I think the 204 is more of a small varmint round Praire Dogs and wood chucks gophers. just my observations. Good Shooting And Good Luck Deathray